Had first dating ultrasound at 14 weeks. edd feb 9, could my edd be off, could my due date b feb 25. seeing if may30 sex did it ?

Due dates: A 14 week scan is plus or minus 10 days or so. Confirm with your OB, not the ultrasound tech is using first for the due day. Due dates are for safety with regards to when its safe to deliver and when we need to delivery. It is a best estimate only. IF there is more than one possible father, you will need to get paternity testing. Anymore only IVF patients have exact conception dates.

Its possible: A due date, based on an Ultrsound in the second trimester can be off a week. So it is possible you became pregnant after intercourse on May 30. Of course there is not way to be sure. Best wishes!

Ultrasound can be of: When checked at 14 weeks of pregnancy the ultrasound can usually be accurate within one or two weeks for the due date. Ultrasounds are usually accurate and can estimate the due date within a week or so. Usually more than one ultrasounds done during pregnancy and this gives a fairly accurate expected due date