my due date is Dec 5th so that means I'm 36 weeks tomorrow but since I had my first ultrasound I had…

my due date is Dec 5th so that means I'm 36 weeks tomorrow but since I had my first ultrasound I had dreams that I was farrier along then what the doctors were saying and today the doctor is saying my baby is weighing 38weeks but still saying I'm 36 weeks so they are saying that if I don't go in to labor on my own before 39 weeks or 40 weeks that I have the choice at 39 weeks to be induced if he is still small enough and if I wait to 40 weeks I would have to schedule a c section. has anyone else having this problem?