Originally Posted by amrijane128
Ack, that is confusing. I've been going by conception date, and can't believe I'm only 3 weeks. Ah... what is LMP?
LMP is 'last menstrual period'. But, calculating your due date based on LMP assumes that you conceived on day 14 or so of your cycle of course, that isn't true for all of us! So, if you know your conception date, you can more accurately calculate the date. There are online calculators, and I also have a gestational wheel, so I could tell you what the due date is with that if you want, too.
As an example, if you conceived on November 1, your edd would be about July 25, and today you'd be 5 weeks and 3 days.
All that being said, ime, most OBs do not like to base the EDD on conception date. They like to base them on LMP and ultrasound dating. But, if you are seeing a midwife, she's more likely to use your conception date.