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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.

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Q: How accurately can an ultrasound determine the date of conception?
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If a woman's periods are not regular and she falls pregnant how accurately can one then determine the conception date from an ultrasound?

For about the first 10-12 weeks all babies grow at about the same rate so term date can be calculated fairly accurately, you then count back 38 weeks for the date of conception. After 12 weeks babies may not all grow at the same rate so it becomes less accurate.


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.


How do you work out conception date from due date?

You can use a pregnancy conception calculator to determine when your baby was conceived. In order to find out your pregnancy conception date you need to know the date of your last menstrual period, the average length of your menstrual cycle and the average length of your luteal phase. Knowing the length of your luteal phase is very important to accurately determine the conception date.


If you found out your pregnant on April 24your lmp started on March 23 when did you get pregnant?

An ultrasound will determine the date of conception by measuring the fetus. You conceived somewhere between March 23 and April 24. It is difficult to pinpoint the exact date of conception this way without an ultrasound to measure the fetus.


Can one determine the date of conseption closer that two weeks?

I am guessing you mean that you want to know your date of conception? It really depends on a couple of factors. If your normal periods are regular, you can be fairly accurate with conception date within a couple of days. Count back 14 days from when your period was DUE (ie but didn't come because you were pregnant) and this will be around the time of conception. Conception date will be within two days either side of this date. If you are pregnant now, an ultrasound will tell you very accurately what your conception date is. As long as you have an ultrasound within the first 10 weeks - the earlier the better. An experienced ultrasonic person can tell you down to the day - ie six weeks and three days.


Which is the date of conception on an ultrasound?

Ultra sound scanning does not give the date of conception, but examining the picture produced an estimate can be made.


When was conception date if due date by ultrasound is 1 of Sept?

November 24, 2011


Are the conception dates from ultrasound different with twins?

No. They are conceived on the same date.


If an ultrasound estimates your due date as September 24 what are the chances the conception was on January 13?

It doesn't look that likely. I'm due September 26th and my estimated conception date was January 5th. If the ultrasound is done in early pregnancy (First Trimester) the accuracy of determining a conception date is within 5 days before or after the conception date, so you have a ten day window. Hope this helps!


When an ultrasound gives me an estimated due date do i count back forty weeks to get an estimated conception date?

No, you count back 38 weeks for the conception date, but don't forget this is just an estimate.


Would excessive drinking the first trimester alter the measurements of ultrasound to determine size and conception date And if so how many days off could it be?

NO ultrasounds measure amniotic fluid and the fetus head, this would not alter you're conception date. If you wanna know you're conception date go to www.webmd.com and they will calculate the time you conceived based on you're due date. It's just an estimate. GOd bless


How do you calculate conception date from ultrasound?

The doctor or ultrasound technician can usually narrow date of conception down to a week by development of the fetus, so if they narrow it down that far for you all you have to do is figure out what day that week you got caught!!! Hope this helps, Good Luck and God Bless!!


If during a ultrasound the doctor says the baby is 16 weeks along does that mean 16 weeks from conception or Last Menstrual Cycle?

It means from the date of conception.


What is your conception date if due date is jun 28?

June 28th 2010? It would make your conception date roughly October 4th, give or take a few days. However, it is difficult to accurately say when a conception date is. Therefore, I suggest talking to your doctor, midwife or obstetrician about it.


How can a tell the date of conception?

by the date of ur last period u would typically ovulate two weeks after that one or two weeks before the next one so sex around this date would be u conception date or by an ultrasound u take off two weeks from how many weeks they say u are and that's the possible date of conception because like everything during pregnancy ur ultrasound is measured by lmp.


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.


How can you determine your conception date if you still have a period?

you are not pregant if u still have it


How far along are you in your pregnancy after your first missed period?

Well, that is something that an ultrasound will have to determine. The theory is that you are pregnant (conception has occurred) sometime after your last period. Conception doesn't necessarily occur the moment that the man ejaculates his sperm into the vagina. So, yes, you did become pregnant somewhere between when you had sex after your last period, but before you realized that you were late in getting your period. This has to be discovered by the ultrasound, to determine the EDD (estimated due date).


Due date 30th march what was conception date?

Roughly July 6th, give or take a few days. However, it is difficult to accurately say when a conception date is. Therefore, I suggest talking to your doctor, midwife or obstetrician about it.


Date of conception 30th may when is due date?

Roughly September 5th, give or take a few days. However, it is difficult to accurately say when a conception date is. Therefore, I suggest talking to your doctor, midwife or obstetrician about it.


Ultrasound tech said you were about 3 weeks pregnant on 061507 when did you conceive?

Determining conception dateMay 20th - 23rd. Can you remember when you attempted to conceive around those dates?Most people I know can determine the event once they get a date in mind.


Why is the conception date and how many weeks pregnant different?

Since most women do not know when they ovulated the best way for medical practitioners to determine the age of your pregnancy is to use something that most women do know and that is the start of their last period. When you ovulate during a cycle can vary so by going by date of last period puts everyone on a similar timeline. The first ultrasound from 7 to 12 weeks can determine actual age of the baby very accurately and give you a very good estimation of due date.


If a baby is born on July 22 2006 what would be the conception date?

It depends on when the due date is, rather than when the baby was born. However, if that was also the due date it would make the conception date roughly October 28th 2005, give or take a few days. However, it's difficult to accurately say when a conception date is.


How do you know if you are over 3weeks pregnant?

It is kind of hard to tell until you get your ultrasound. But you can Google pregnancy calculators and it can help you determine the date of conception by entering in some information (such as when your last period was, possible days of intercourse etc.)


How accurate is an ultrasound at 5 months to determine date of conception?

Currently it is pretty reasonable, although not exact. I would give a fudge factor of a week one way or the other, particularly if you weren't having sex frequently.

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