is it possible my doctor got my due date wrong
Of course it is impossible for your doctor to say exactly when you ovulated. He is probably using the normal formula of next period due date - 14 days, and as I said, this can be off by 2 days either way.The good news in all of this is that sex with your (ex-)bf on Aug 5/6 was way too early so I think it is safe to say your (ex-)fiance is the daddy.t is possible that the due date may be wrong. It is based on various formulas and possibly on information you gave to the doctor. He might have misunderstood or missheard. If you had a scan before week 20, the due date will be pretty accurate.