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A 29-year-old female asked:

due 08, 29, 2013, conception date range?

1 doctor answer1 doctor weighed in
Dr. Seth Derman
Fertility Medicine 33 years experience
Around december 6: If your due date is 8/29 you probably ovulated around 12/6. There are due date calculators and pregnancy wheels that you find on the internet that can help you find out.

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A 42-year-old member asked:

Need to know how to calculate conception date from due date?

1 doctor answer1 doctor weighed in
Dr. Edward Jacobs
Obstetrics and Gynecology 46 years experience
Naegle's rule: By universal convention, a pregnancy is dated in weeks since the date of the last menstrual period. The due date is 40 weeks from the first day of the last period or approximately 38 weeks after date of conception. Your OB can give you a better answer after your first early ultrasound around 8 weeks....
A 43-year-old member asked:

Explain due date based on date of conception?

1 doctor answer2 doctors weighed in
Dr. Neeoo Chin
Fertility Medicine 40 years experience
Due date: The normal term pregnancy last 40 weeks. This is calculated from the last menstrual cycle. The last menstrual cycle calculation relies upon the fact that ovulation occurred on day 14. But if calculations are from the date of conception then the pregnancy is only 38 weeks.
A 43-year-old member asked:

Tell me how do you calculate date of conception?

1 doctor answer1 doctor weighed in
Dr. Edward Jacobs
Obstetrics and Gynecology 46 years experience
Depends: Conception usually occurs about 14 days prior to the onset of the next expected period. If the periods are 28 days apart, conception occurs around day 14. If the periods are 32 days apart, then conception occurs on day 18 (32 minus 14 = 18) etc, etc.
A 43-year-old member asked:

Where can I find a due date calculator by conception date?

1 doctor answer1 doctor weighed in
Dr. Joseph Pena
Fertility Medicine 25 years experience
Internet options: There are quite a few websites that can calculate this. Here's just a couple: http://www.Justmommies.Com/duedate.Shtml http://www.Whattoexpect.Com/toolkit/duedatecalc/duedatecalc.Aspx.
A 47-year-old member asked:

How to calculate the date of conception backwards?

2 doctor answers3 doctors weighed in
Dr. Barak Rosenn
Maternal-Fetal Medicine 39 years experience
Use an app: There are many apps available where you can enter your due date and get the date of conception (look for "pregnancy wheel". Alternatively, if you know what week you are today, convert the weeks into days (for instance, 18 weeks and 3 days equals 129 days), then subtract 14 days (129-14=115), then count back that number of days. This will give you your conception date.

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Last updated Jun 10, 2013

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