Conception Dates

Questions pertaining to the date a baby was conceived by the mother and father

2,838 Questions
Periods and Conception
Conception Dates

How do you figure out the date of conception to know if you are the father?

If your girlfriend doesn't know the conception date, I don't think there's really any way anyone could tell you.

Even a baby's due date or actual delivery date offers no real clue as to the exact date of conception.

You might try the conception calculator linked under more info in the right column.

You can always get a DNA test, or you can trust your girlfriend and love the baby as your own any way.

A women generally ovulates 14-18days after the first day of her last menstrual period. If you know the first day of your last menstrual period then you can estimate the week conception occurred.

Given that sperm can live for days within the women, during the conception date may be difficult. If a women has sex on Friday, Saturday and Sunday with three different men, any of them can be the father.

Set your mind at ease and get a DNA test.

You really won't be able to pinpoint the exact date. you can find aproximately by knowing the day her last period started and how long her cycles are. It would be an aproximation though.

Hopefully you are still on good terms with your girlfriend, if you should attend the doctor visits, then one thing is of great help, when the first ultrasound is given, hopefully before the 11th week, there is a measurement that is given called a crown rump length, this is very very accurate in telling the gestational age of the child. after the 13th week, the baby is able to curl so the accuracy is not there, the spinal segements have formed. Crown rump length will give you a very accurate date. Good Luck. I hope everything works out for you.

Periods and Conception
Due Dates
Conception Dates

How do you calculate a date of conception?

Conception usually occurs around the 14th day from the first day of your period.

For a current pregnancy, the related link below may be helpful in calculating the approximate date at which conception occurred.

Conception Dates

Is there a difference in how long XY-chromosome sperm for boys and XX sperm for girls live?

Sperm for Girls and BoysYes. The X sperm (which are the sperm that make females) live longer than the Y sperm (which are the sperm that make males). However, the Y sperm swim faster, so the chances are equally good that you will get a girl or a boy. If the Y sperm swim fast enough before they die to fertilize the egg, then you'll have a boy. If the Y sperm don't reach the egg before they die, chances are an X sperm will get there shortly, and then you'll have a girl.

Here is more input and advice:

  • X sperm are stronger than Y sperm but both will perish very quickly if allowed to dry out.
  • The female carrying sperm are the slower sperm because of the genetic material it carries. The female sperm contain an X chromosome, while the male carrying sperm contain a Y chromosome. The Y chromosome is very small and contains very little genetic material in comparison to the X chromosome, so the male carrying sperm are able to swim faster and reach the egg sooner than the X carrying sperm.
  • A baby's gender is determined by the chromosomes in the sperm, not the egg. XX makes female, XY makes male, all eggs contain an X chromosome, so sperm donates other X or Y chromosome. Female sperm live up to 5 days, male sperm up to 3 days. (Egg lives 12 to 24, maybe even 36 hours after ovulation.) Female sperm live longer but swim slower than male sperm. (Vaginal environment supposedly contributes to sperm longevity, alkaline/acidic - male sperm prefer baking soda douche prior to sex, female prefer acidic (vinegar) (supposedly) - but most importantly of all, male swim quicker, so for male baby, have sex within 6 hours before ovulation, to beat female sperm to egg. Vice versa, for female baby, have sex 3-4 days before ovulation, for better chances of having a girl baby. Test for ovulation with home ovulation testing kit, get familiar with when you ovulate, and plan accordingly for future ovulations and future timing of intercourse.
  • Men produce two types of sperm, those containing the X chromosome, female sperm, and those containing the Y chromosome, male sperm. Sperm are being produced continuously, they take about a month from the beginning until they are mature. As the Y chromosome is smaller than the X chromosome the male sperm is lighter and faster than the female sperm and therefore gets a head start towards the egg. Female sperm being heavier have more staying power and can keep going for longer.

This is not really true

What your discussing is Dr. Landrum Shettles method and his research has been question by better scientist than him. He was trying to sell a book.

There's no dispute that the X chromosome is bigger than the Y chromosome, as this photo clearly shows. But the sex chromosome is only one of the 23 chromosomes carried by a sperm -- in total, an X sperm carries only 2.9% more genetic material than a Y sperm. As you can see, the difference isn't that great.

Total DNA in X Sperm

Total DNA in Y Sperm (2.9% less)

Data from the study shows that, not only are X and Y sperm indistinguishable from one another, even abnormal sperm cells with the wrong number of chromosomes -- too many or too few chromosomes -- cannot be identified by having a different shape or size.

Due Dates
Conception Dates

What is the best way to calculate due date and estimate delivery date?

It is really complicated. The simple calculations listed below based on a fixed addition from your last menstrual period or those used by most online calculators are terribly inaccurate. A lot of recent research has indicated a number of other variables to consider. (See the page links, further down this page, listed under Related Links).

This is how to calculate your due day. The due month is: your LMP month + 9. The due date is: your LMP date plus 7. For example, if your LMP was 3/10/95: 3 + 9 = 12 (Dec), 10 + 7 = 17 (17th day). If the added month exceeds 12, then you subtract 12. For example, if you LMP was 6/20/95, the month will be (6 + 9) - 12 = 3 (March), and the date will be 20 + 7 = 27, so your due date will be 3/27/96.

  • There are loads of methods and calculators out there but their accuracy is limited.
  • I was always taught -3 +7, if your LMP was 10/11 you -3m= 7/11 and add 7d= 7/18.
  • You can always use an online due date calculator. See the page links, further down this page, listed under Related Links.
  • Maybe I don't get it but what is all the maths above? Why would you do all this if someone else would do it for you?
  • Due Date Calculation

Pregnancy, on average, lasts 267 days (38 weeks) from conception. If you positively know your conception date, you can add 267 days to it for your due date. The following formulas can also tell your EDD:

Date of the first day of your last period + 281 days = due date
Date of the first day of your last period + 7 days - 3 months = due date
The methods here are based on the average 28-day menstrual cycle.

Due Dates
Conception Dates

When did you conceive if your due date is March 12?


There is no way to tell the exact date, but an estimated date would be around December 19th.

Alternately, according to your due date, you conceived around 11th January. However, some women ovulate later than others so give and take +/- 5 days.

Visit this site below and scroll down till you get to the table. This will give you an accurate reading based on the first day of your last menstrual period and or due date.

This is wrong... If your due date is in March how could you have conceived in January??

My son was born on March 13 and i conceived him on June 16th... If you wanna find out when u conceived you can generally add 3 months to the due date...

Your conception date was most likely Friday, June 19, 2009

You are in Week 20 of your pregnancy
Your Third Trimester will begin 12/11/2009
135 days down, 145 to go!

Your baby will be born in the Year of The White Metal Tiger
Half Birthday: September 10
Birthstone: Aquamarine (Courage)
Astrological Sign: Pisces
Birth Flower: Daffodil or Jonquil (White or Light Blue)
This time next year your baby will be 32 Weeks Old!

Your baby will start kindergarten in 2015, be old enough to drive a car in 2026, graduate high school with the class of 2028, and will finish college in 2032, give or take a year. Can you imagine?
Due Dates
Conception Dates

When did i get pregnant if your due date is nov 7 2011?

That makes your estimated conception date February 13th 2010. This could be wrong by a couple of days. It depends when you actually ovulated.

Due Dates
Conception Dates

Conception aug 2 when is baby due?

The due
date for yoyur baby is 9 May

Maternity and Paternity Leave
Conception Dates

How accurately can an ultrasound determine the date of conception?

Ultrasounds measure the size of the fetus to predict a due date and are usually very accurate, within two weeks, so I would safely assume that it would not be off by five weeks. You can ask your doctor, it won't be the first time he or she has answered that question,I promise.

Also it depends on when the U/S is. U/S before 12 weeks of pregnancy are very accurate, plus or minus 2 weeks. After that there are more varibles, babies grow at different rates so they are not as accurate.

Due Dates
Conception Dates

When would the baby have been conceived if your due date is March 12 2011?

Roughly June 18th 2010

Conception Dates

Does conception date mean the date you actually had intercourse and the sperm connected with the egg?

They day you have intercourse isn't necessarily the day the sperm and the egg connnect. Sperm can live for up to 3 days inside you before fertilizing the egg. And there is almost no way of knowing the exact date of conception. Aug 21st is just a really good estimate. If the father is what you are unsure of, have a blood test taken after the baby is born if it matters to you. Otherwise, you can always raise the baby as yours and your boyfriends if that is what you choose to do. Good luck! you!

YES!!! The meaning of Conception is the formation of a viable zygote by the union of the male sperm and female ovum; fertilization.

July 31st, 1964 was when I was born. What day was I conceived?

Conception Dates

When did you conceive if your baby was due December tenth?

December 10th 2010? That would make your conception date roughly March 18th

Conception Dates

If your baby was born 17th of September what date did you conceive?

The approximate date of conception was December 25th

Due Dates
Conception Dates

If you conceived on February 14Th when is you due date?

November 8th

Due Dates
Conception Dates

If you conceive in January when is your due date?

9 months later meaning around September.

Due Dates
Conception Dates

You think you conceived on May 8 what is your due date?

May 8th 2010? That would make your due date roughly February 12th

Conception Dates

If I'm due December 1st when did I conceive?

The approximate date of conception was March 10th

Due Dates
Conception Dates

If born on June 19 what date were you conceived on?

The approximate date of conception was September 26th

Conception Dates

When did you get pregnant if my due date is December 18?

Based on a normal gestation period of 40 weeks the conception date was March 27th

Conception Dates

When did I conceive if the baby was born on August 14th?

August 14th 2009? This would make your conception date roughly November 20th, give or take a few days. However, it is difficult to accurately say when you conceived. Therefore, I suggest speaking to your doctor, midwife or obstetrician about it.

Conception Dates

Your due date is March 14 when did you conceive?

The approximate date of conception was June 21st

Parenting and Children
Periods and Conception
Conception Dates

If the due date is August 8 when is conception?

Get the calendar out on that one and count 40 weeks back

Baby Names
Due Dates
Conception Dates

If your due date is June 9 how far along are you?

if i am due June 9th how far along am i

Due Dates
Conception Dates

What date did you conceive if your due date is feb 17?

I will assume you are talking about February 17th 2012. If so, it makes your estimated conception date May 26th 2011. However, this date could be out by a couple of days. It all depends on when you actually ovulated.

Due Dates
Conception Dates

When did you get pregnant if your due date was February 14?

I will assume you are talking about February 14th 2011. If so, that makes your estimated conception date May 23rd 2010. However, this date could be out by a few days. It also depends on your menstrual cycle.

Conception Dates

When the national stock exchange of India was inaugurated?

July 1993


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