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Accurate conception dating

Any calculation of a conception date is an estimate, even in a woman with regular 28-day menstrual cycles. Except for in-vitro fertilization (IVF) and other assisted reproductive procedures, you cannot precisely calculate the exact day a sperm meets an egg and fertilization (conception) occurs. However, you can use various  ...

Mar 28, 2017 ... Gestational age, or the age of the baby, is calculated from the first day of the mother's last menstrual period. Since the exact date of conception is almost never known, the first day of the last menstrual period is used to measure how old the baby is. Use our Pregnancy Calculator to calculate these dates for ...

How do you calculate due date from conception? If you know when you conceived, our pregnancy calculator calculates your due date by adding 38 weeks to the date of conception. This method of calculation may be more accurate than a LMP due date calculation if you have irregular or consistently longer or shorter cycles ...

Jul 15, 2010 ... So I am pregnant again and over the moon, but it came as a bit of a surprise so I am not sure of when my LMP was. Since we already have 2 little sprockets our alone time is few and far between so I know the exact date of conception, however the date's of conception do not equal the date's of the dating ...

I concieved on sept 2nd, but after my doctors visit, with the ultrasound and other tests, results say i actually conceived two weeks prior when i know that isnt the case.. How accurate are the conception dates?

I would like to know the accuracy of ultrasounds in the first trimester. Would it be possible for them to be off 4-5 wee.

The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, and that ovulation and conception occurs on day 14 of the cycle. Use of the LMP to establish the due date may overestimate the duration of the pregnancy, and can be subject to an error of more than 2 ...

Feb 16, 2011 ... The conception calculator can be used to estimate the date of pregnancy conception. Conception calculators use the first day of the previous menstrual cycle to estimate the date of conception. Models are based on your menstrual cycle length and the estimated time of ovulation. Ovulation is the time when ...

Ultrasounds are more accurate at 6 weeks for this purpose than at 10 weeks, and the way she is taking Plan B, she would certainly have irregular cycles that could not be used to count forward from to determine a conception date. By 10 weeks, an ultrasound could be several days off for dating purposes. Sex prior to January  ...

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