44 weeks 😳

The past two appointments with my OBGYN I was measuring ahead. Last time He was two weeks ahead and a couple pounds heavier at 5pounds 4oz and 90th percentile. Today though im measuring 44 weeks and I'll be only 33 weeks this week? Has ANYONE ever experienced or seen this? I'm not having twins... I don't have gestational diabetes... I'm supposed to go by c section May 9th but my worry is that I'll go into labor before that. They are now ultrasounding me every week. Typically they won't take you by section before 39 weeks but are there situations where they might feel it's necessary to because of measurements? Getting worried here!!