Baby is measuring 2 weeks ahead

Had a growth scan yesterday at 31 weeks 2 days baby girl is measuring 33 weeks 4 days they are talking about moving my due date because my 21 week ultrasound she measured 22 weeks and 3 days my son was 23 inches long and weight 8lb 6 oz when he was born at 38 weeks 4 days he measured a week ahead the whole pregnancy except my first ultrasound which is how she's done is it safe to change the due date now they are mainly talking about if I carry to my due date she can be to big to come naturally but they are saying if I go into labor early they won't stop it like what I believe to be 35 weeks because she would be measuring 37 weeks and if I don't have her by her current due date they will induce me 3 days later as to keep her from getting to much bigger and if the change the due date I would be 42 weeks the day of her due date