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usually when you get pregnant, it is the 14th day after the 1st day of your period. my mom always told me not to have sex between the 11th & 17th day after the first day of your period. Sperm lives for 72 hours and the egg is usually dropped the 14th day. so any of those days could be the conception date.

While this answer is very good sperm actually can live in the female body for up to 7 days just a little extra info... !!!

To answer the question as asked, NO an ultrasound scan cannot tell you the exact day you got pregnant, it is only accurate to within about 4 days if done at six weeks. The further on the pregnancy is the less accurate it becomes.

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โˆ™ 2015-07-15 20:49:16
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Q: Can the exact date of conception be told by a dating scan?
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How do you find out the date of conception using your child's birth date?

You can't work out the exact date of conception from a birthdate as babies can be born healthy at any time from 35-40 weeks after conception. If you had an early scan (before 12 weeks) and that gave you an estimated date you can work back 38 weeks from that and get a rough guide.


Can you work out a conception date from scan dates?

I think so. I think if you use the first scan gestational age and minus two weeks that gives the approximate conception date giving a few days either side.


You had a period on 08.06.06 and the early scan date said you were 10weeks and 5 days on the 25th August is this a conception date or lmp?

LMP. Conception date would have been about 2 weeks later.


If you are 11 weeks pregnant how do you determine the conception date?

Conception date is based on your last ovulation cycle prior to when you didn't get your period. But this can be incorrect if you didn't conceive when you was ovulating. Alternatively you can have a ultrasound scan which will give you a conception date but this can be off by 5 days.


Can a dating scan for pregnancy be as much as a week off when done before 10 weeks?

Yes it can be sometimes when your around 6-7 weeks into your pregnancy. At 10 weeks, based on the size of the foetus and conception date a pretty accurate date can be arrived at. Yes it can if you have a long cycle. My date from my period was 23rd September but I had a 36 day cycle and my scan date was 4th October.


Is the EDD given to you on your scan date from your LMP or by the date of conception?

EDD is ESTIMATED. If done by scan is 38 weeks from conception. An EDD is based on the LMP (last menstrual period) and not the date of conception. The ultrasound measurements are comparing the baby to the expected size of other babies at the same gestational age. The earlier the ultrasound is done in the pregnancy, the more accurate it will be. Hope this helps! Dr. B.


Can you count back the weeks of your pregnancy from a dating scan to see when you may have conceived if your LMP is unknown?

I just had a child and I had no idea when my last MP was or when around he was conceived, but if you know already how old around the fetus is, then you can get somewhat of an idea, but it won't be exact. Yes. If you count back two weeks less than the length of your pregnancy, that is approximately when you conceived. For example if your dating scan says you are 10 weeks pregnant, counting back 8 weeks will give you your approximate date of conception.


What is a fetus's gestation age and due date when the LMP is unknown and can you count back the weeks at a dating scan to see when possible conception occured?

When you have a dating scan the scanner compares the size of the fetus with the size of fetuses of known gestation. The gestational age assumes that the mother has a regular 28 day cycle and got pregnant 14 days before a period. the gestational age is calculated from this notional LMP. This is accurate in about 85% of cases. If you don't know your LMP and have been given an EDD/gestational age you need to take off 2 weeks to find an estimated date of conception. this website will help you. http://www.genetree.com/about/conception-calculator.asp


Is the scan date from your last period or when you conceived?

The scan date is from your last period.


You had a scan done at the hospital and the sono said you were 6 weeks pregnant but then you went to your doc and he said you were 4-5 weeks y would this be?

Doctors are scientists, not psychics. Your doctor was making his best guess with what information he had. Chances are the scan provided more detailed information and is more correct. The exact date of conception is nearly impossible to figure out unless the woman can say with certainty.


If your due date is April 3rd is there any way your conception could have occured on the 27th of June if an ultrasound confirmed you to be 6 weeks pregnant on August 10th?

Six weeks pregnant on August 10th gives a due date of April 3rd, a conception date of July 12th and a last period around June 28th. a scan at this early stage is very accurate.


If an ultrasound at 14 weeks showed your due date as Oct 2 and an ultrasound at 20 weeks showed the same but a 28-week scan gave a Sept 23 due date could you have conceived before Dec 12?

Absolutely not. The later in pregnancy the less accurate the scan. The first two giving a due date of October 2nd will be correct and give you a conception date of around January 9th.


When did you conceive if your due date is February 3?

If his date was determined by an early scan you probably conceived sometime around 11 May 2004 give or take 4 days. If however he was born on 3 Feb as a term baby and you had no scans the conception date could be out by 3 weeks.


When will you have your first scan?

you will usually have your first scan between 10-14 weeks, this is refered to has your dating scan, and you should be told how far in pregnancy you are


Why are 2 weeks taken off your ultrasound scan age?

Because it's about 12 days of conception


What is a skill scan?

A Skill Scan is a statement that describes your skills, knowledge and qualities to date.


When did you conceive if your due date is July 19?

Sometime around October 24th 2005. that is what this calculator said anyway. http://www.genetree.com/about/conception-calculator.asp I have to add that I conceived on 2nd January (husband went on a business trip the next day) and when I had my scan I was given a date of 4th October.


If you were told on May 14th you were 5 weeks 2 days pregnant Could you have conceived on April 26th or 27th?

That really depends. It mainly depends on how they arrived at that figure. If they calculated that based on the date of your last menstrual period (LMP), then the actual date of conception would have been closer to the 21st of April plus or minus a couple of days. If that figure was calculated from an ultrasound scan, then the date of conception would probably be closer to the 7th of April plus or minus a couple of days. Aj :)


What can be learned from a bleeding scan?

The scan gives a rough, though not exact, guide as to the location of the bleeding. It can tell where the bleeding may be, but usually not the cause.


If you have an irregular period how do you know when you conceived?

I guess they would be able to tell you when a dating scan is done to determine due date. Mine have never been regular but they just adjusted dates as pregnancy progressed.


Why do they go by the the first day of your last period instead of conception?

Because women were falling pregnant before midwives knew about the science of conception and implantation, the only date anyone knew for sure was the date of the LMP (last menstrual period). Also, just because you have sex on a day, does not mean that you conceive on that day- sperm take several days to travel to the ovum, and so the actual date of conception will remain a mystery. When you have your first ultrasound scan, you will be dated based on the size of several parts of the foetus' body, include head circumference and femur length. This will give a much more accurate indication of gestational age, and if you work backwards, you can calculate the date of conception- remember though that the act of love making would have happened a couple of days before. Hope this helps! Aj :)


Would a scan be offered to find out a babies due date?

Yes. Ultrasound scan is routinely done to know the expected date of delivery. There are many points to be noted. This one is always there.


Would an ultrasound be able to tell the difference between a fetus at 4wks3days and 7wks3days from conception your scan showed a faint flicker of a heartbeat which date is it more likely to be?

Absolutely a scan can tell the difference within 3 weeks at this stage. The heartbeat would be visible at both 7 and 10 weeks (which you would be pregnancy wise). Measurements are taken to date the pregnancy so you need to ask the doctor/tech/nurse how many weeks pregnant you are.


What would be the most logical reason that a baby would measure 4 weeks ahead on an ultrasound and can a scan be that much off?

If it is an early scan you must have got pregnant the month before. If it is a late scan (after 30 weeks) you may have a big baby. An early scan cannot be 4 weeks off. http://www.genetree.com/about/conception-calculator.asp


Your first scan was 271106 when did you conceive?

There is not enough info to answer the question. When was your last period? Or what is your due date? How far did they say you were at your scan? You can also google due date calculator put in your info and it will give you your answer.