Hello everyone!! I have a question and I'm hoping someone can help me out. I'm 31 weeks 5 days. I went to the doctor yesterday and she told my uterus is measuring 36 cm and my baby is 3 1/2 pounds. She said that's big for how for I am. 31 weeks usually measures 28-32 cm. She said at 37 weeks she will do an ultrasound to make sure I'll be able to have a vaginal delivery. What does it mean that 36cm at 31 wks??