Thats not always true. With my first baby they said due to my period shed be due april 22nd and so when we got the ultrasound to find out her gender we found out that her actual due date would be march 9th (she ended up being born on the eighth but thats besides the point) I'd say just wait til your next appointment and ask your doctor/ ultrasound tech for a confirmation. Thats what i had to do in the end.View Thread