Accurate conception dating

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Because ovulation is not an easily observed event, using Naegele's rule provides an indirect measure of conception and remains the current standard for calculating the EDD based on the first day of the LMP.The reliability of this method depends on several factors: the woman's accurate recall of her LMP; the regularity of her cycles; the presence of early or light bleeding; and other factors, such as oral contraceptive use or breastfeeding that could influence ovulation timing.This tendency towards preferred numbers further increased the discordance with ultrasound dating -- a factor Savitz et al.prospectively studied women's recall of their most recent LMP and found their study participants' memories became significantly less accurate over time, even by as little as 3 weeks from the actual onset of their last menses.

In their assessment of 498 normal menstrual cycles, they reported a range of 7 to 19 days for the luteal phase, with only 10% of women ovulating on day 14.Want to know what date and day of the week you were likely conceived on?Simply select your birthday (or due date if you were born premature or late) and click the "Calculate Conception Date" button.This free online conception calculator will determine the conception date -- including the day of the week -- based on your pregnancy due date, ultrasound, or the 1st day of your last menstrual period (LMP).Plus, unlike other conception calculators, this calculator includes selectable dates dating back 100 years, which means it can also be used to calculate conception dates and days of the week for any dates of birth occurring within the past 99 years.

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