Baby measurements

Pte

According to the doctors early ultrasound I'm only 35 weeks and 4 days. Yet according to my LMP I am 37 weeks and 5 days. Two completely different dates. Now I am measuring at 41 weeks according to the size of my uterus. Baby is measuring the same on U/S. He is 8 lbs 3 oz. I do not have GD and I'm perfectly healthy. These dates got me screwed up. I feel like I'm further long then what the doctors are saying. It is making the options they are giving me very confusing. They want to do another ultrasound on the 28th or March. Based off that u/s they want to do an amniocentesis to see how baby's lungs are developed then go for an induction because of his size. I'm totally freaked by any of the

Options provided. The other option was c section on April 13th because of size. I just want a natural birth. Can anyone out there relate? Also, I am 40 years old. But I'm healthy and strong. My BP is fine and swim every single day.