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A 28-year-old female asked:

can estimated conception date at 8 weeks be off by a month?

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Not a month: Asking the question, "Can something happen?" will almost always give you a YES answer. That's because something indeed CAN happen, even if it only happens once in a million years. That means asking if something CAN happen is not a useful question. The real question is, "How likely is something to happen?" In real life, ultrasound dating at 8 weeks is not going to be a month off.

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NC
A 23-year-old female asked:

If my estimated due date is nov. 19, what is my range of possible conception dates?

1 doctor answer3 doctors weighed in
Dr. Gerard Honore
Fertility Medicine 29 years experience
2/26/2012: February 26th is the estimated conception date. Ranges cannot be estimated reliably, they can only be guessed, it's working backward form a simple arithmetic formula.
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 30-year-old member asked:

Is a date of conception due date calculator recommended?

1 doctor answer1 doctor weighed in
Dr. Alan Patterson
Obstetrics and Gynecology 42 years experience
U can: Ask your OB he or she can figure it out based on how often your periods are and when u are due.
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.

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Last updated Jul 5, 2018

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