It all depends on how accurate your due date is. Did it come from an early ultrasound? Or was it computed forward just using the first day of your last period?
Using the first day of my last period, which was May 11th and my due date is February 15, 2015
Have you had any ultrasounds at all during the pregnancy? (The problem with computing from the first day of the last period is that it can be very imprecise, especially if your cycles are not like clockwork.)
Yes I have had ultrasounds
When you had the earliest one, what number of weeks pregnant did it say you were (it might be labelled "GA") and what estimated due date did that earliest ultrasound give you?