A conception calculator estimates the date of conception based on a known due date or last menstrual period (LMP). Conception typically occurs 14 days after the LMP in a 28-day cycle, about the time of ovulation.
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Pro Tip
The estimated conception date is useful for determining the father when timing is uncertain, but DNA testing remains the only definitive method for paternity confirmation.
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Did You Know?
Only about 4% of babies are born on their exact due date. The average first pregnancy goes 41 weeks and 1 day. The conception date itself is often uncertain — fertilization can occur up to 5 days after intercourse.
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