Pregnancy Conception Date Calculator: Estimate Your Due Date

To calculate your conception date, you need to count back from the first day of your last period (May 27, 2008) and subtract two weeks. This is because ovulation typically occurs about two weeks before the start of a period.

So, counting back 14 days from May 27, 2008, your estimated conception date would be May 13, 2008. This date aligns with your ultrasound estimate of being 8 weeks pregnant, as the ultrasound measures gestational age from the date of conception.