Are there other ways to determine when a child was conceived other than the 1st day of last period?

I'm not sure of the accuracy of the first day of my last period. If the conception or gestational period is based on that, then it may be far from accurate and a very bad guesstimation.





Just curious.





I guess they doctor can guess based on the length of the fetus. Are there other ways to find out the range of days of possible conception? Or has anyone heard of any other ways? I appreciate all positive inputs in advance.|||The best way is to have an ultrasound early on. Early ultrasounds are generally fairly accurate. They won't ever be able to tell you the exact day though, it's all based off of averages.


The measurement of HcG (the "pregnancy hormone") is also used, but that has an even broader range of accuracy than an ultrasound would.|||They measure the fetus and will give you the approximate age. Know that the age they give you will count weeks from the first day of your period, not from the day of conception. It won't be your actual period date, but the measurements are usually recorded that way. So, if they say you are six weeks pregnant, you have to go back four weeks to find your approximate conception date. Also, if you noticed any signs of ovulation (e.g. a change in your cervical mucus, egg-white texture, etc.) at a particular time, that can help you get an idea of when you might have gotten pregnant.|||There is probably no perfect way of saying that it was on such a date or time, there is bound to be one child in every so many million who does not conform, for some reason or other, to the recognised processes for dating.





The scan is as accurate as it is possible to be and doctors usually put more reliance on that information than the mother's reported last period date.|||I think by looking at the fetus the doctor can estimate just how far a pregnant woman is.|||Other then a sonogram I don't know.





When I was pregnant they first went by my last period but after my first sonogram my due date got moved back 3 weeks.|||Call Maury Povich, he takes care of those questions each week.


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