Baby measuring big...

Kayley • 24 years old, I have a little boy who’s 4 and I’m TTC my second baby!! 👶🏻
I really don't understand this. I got sent for growth scan as baby is measuring small, went for scan got estimated weight of 5lbs 13ounces. I am 35 weeks tomorrow. I then got told baby is measuring big for 35 weeks. I lost my mucus plug the other day, could they have messed my due date up. Could i be due baby earlier than they think? 😕