My last period was October 9, 2006 which would make my due date July 16, 2007, but when I had got an ultrasound on May 18 it said that my due date June 30, 2007. The ultrasound said my baby wighted 4 pounds and 11 ounces. I was suppose to start my externship for school on Monday the 4th of June but I don't know if I should wait until after I have my baby to do my extern or not. I don't understand how I could have "two" due dates.:confused: