Hi, i got an ultrasound 2 weeks ago and they said I was 7 an a half weeks pregnant and due on the 21st of august.. But the doctor and every app I use calculates my due date from the first day of my last period which was on the 8th of november and says I'm 10 weeks and 2 days, due on the 15th of august.. I was wondering how far along I am an what would be my correct due date ? Thanks (-: