Best Answer

See the Related Link for "Conception calculator" to the bottom for the answer. For example, if the first day of your last period was January 22, the date of conception will be somewhere around 5th/6th February if you have a 28 day cycle. The majority of women ovulate 14 days before a period, and most have a cycle of around 28 days. From ovulation to birth is 38 weeks and for the hundreds of years before ultrasound, working out 40 weeks from the beginning of the last period was the only way of working out the due date. If your cycle is shorter or longer than 28 days, work out when your NEXT period would have been due and you probably conceived about 14 days before that.

User Avatar

Wiki User

โˆ™ 2007-03-24 11:29:36
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How do you find out when you conceived based on the first day of your last period?
Write your answer...
Related questions

How can you find out when you conceived if you don't know when your last period was?

the docter can tell you when you go for your first scan he measures the baby

When can you first find out that you have a baby?

if you missed a period, (or it's been about a month since you think you conceived it) then you can finally buy a pregnancy test and see..

Hi I havent had a period since Jan 09 Im 19 weeks pregnant and my due date is 4th Jan 2010 How can find out when I conceived?

Based on you're due date you most likely conceived april, 13 2009. If you had an early ultrasound in you're first trimester then you're due date is pretty accurate.

Can an obgyn find out if a female is pregnant two weeks before your missed period?

Possibly. Assuming you conceived just after your last period, and it's been two weeks. But really, such tests are hardly worth doing until you've had the first indicator, which is the missed period.

Do you start counting from the day you get your period to find out if your pregnant?

If you get your period chances are you are not pregnant. If you don't get your period and you are pregnant, your doctor/midwife will want to determine when you most likely conceived, to do this he/she will want to know the first day of your last period. If you have a 28 day cycle ovulation usually occurs in the middle of your cycle.

How do you find out the date you conceived?

I had had sex with this guy on May 22nd. I had gotten my period that day. And it was my normal period. Then in June I had sex with another guy and I missed my period on June 23rd. I'm just having a hard time trying to figure this out so could someone please help me out?

How far along are most people when they first find out they are pregnant?

When they miss their first period.

How do you find out your baby's due date if he was conceived while you were on the pill?

An ultrasound

How can you find out the day you conceived?

The day you banged yo baby daddy!

Is it possible to find out the exact day your baby was conceived?

no doctors nr clever

Are you pregnant during the 2 week conception period?

Yes, technically your first week of pregnancy is the week of your last period which is odd because you haven't even conceived yet! Welcome to the wonder world where mathematics and pregnancy don't mix and you somehow squeeze 40 weeks into 9 months?! By the time you actually find out you are pregnant you are generally 4 weeks along because the 4th weeks is the week you would generally miss your expected period.

What day was i conceived on?

Find your age on your last birthday ... from that you will know your birth year ... from your birth date in your birth year, subtract 9 months and you will have a rough idea on what date you were conceived.

How long does it take for a girl to find out shes pregnant?

Some women just know the moment of conception. Others, however, will start to notice symptoms after a missed period which is usually 28 days (4 weeks) after she has conceived.

Is there a test you can take to find out when you will start your first period?

No, sorry. This will just happen when it is time.

How can you find out when you conceived by your due date?

Pregnancy usually takes 278 to 281 days.

How do you find out when i was conceived?

From your birthdate, count backwards about 37 weeks. That will give you a rough idea.

What do you go by to find out if your pregnant the first day you started your last period or the last day of your period?

I think you go by when the sperm unites with the egg

Is it possible to get pregnant if you got sex at the 14th day from the first day of your period?

Hi , Yes it is the best time to get pregnant due to ovulation on 14th after/before period. based on a 28day cycle. if you do find out you are ,con glads.. if ur not happy with it Best time to have unprotected sex is on our period ,,very unlikey to get pregnant on your period.. only STDs are easier then.. good look,, DR read a lot.

How far along are you if the date of the first day of my period was December 16 2008?

You need to give us the date of your last period before we can find that out

How long does it take for a doctor to find out if you are pregnant?

Around 14 days after you think you may have conceived.

What is anew religion based on current beliefs?

Self realization is first step to find what is the cause of different religions. The new religion teach to find himself first .

Is it normal for the first few days of your period while on birth control to be very very light practically not there?

You will find that your period is lighter when you are on the pill (or patch or injections).

What animals lived during the tertairy period?

erm might wanna find out meaning of tertiary first

Can you cause heavy bleeding or the start of a period after having first time sex?

maybe... you should find out

How far along are you in your pregnancy when you miss your first period?

that's when u find out your pregnant so that's in the first week of your baby growing