Ok, going off last menstrual cycle my due date is February 26th. At my first appointment my OB ordered an ultrasound to get an accurate measurement. I just got a call earlier today that based on the ultrasound my due date is March 9th. Something just isn't adding up in my book; if that was right I wouldn't have conceived until several days after I got a positive test at home (I keep notes on almost everything regarding my health, and I did the math). My cycle before this pregnancy was like clockwork and I'm just not seeing how there could be almost a 2 week discrepancy. Has anyone else had something like this happen or am I just over thinking this?