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To calculate your conception date: Methods used to estimate conception date rely on trying to identify the day of ovulation.

Your most fertile time to conceive is within the day or two after a positive result.

If you did an LH kit during your concepion cycle, take a look at your test results.

If you were charting increased pain at mid-cycle, the day of the worse pain on one side of your pelvis is the likely day your egg ovulated.

This is probably the day you conceived if you had intercourse around that time.

An ovulation predictor kit (OPK or LH kit) reliably predicts the window of ovulation, according to a study published in 2000 in Human Reproduction.

The at-home urine test measures the increase in the pituitary luteinizing hormone (LH) that occurs in the days leading up to ovulation.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.According to Clinical Gynecologic Endocrinology and Infertility (page 1285), the egg survives in the female reproductive tract only for about 12 to 24 hours after ovulation.Sperm retains its best ability to fertilize an egg for an average of three days in the tract after ejaculation, although it can survive up to five to seven days.If your cycle lengths vary a lot, your results might not be accurate.

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