31.3 weeks with big baby

Had our check up today. Big baby weighing per ultrasound 5.5pounds and 1 month ahead due date isn't until 1/6/17 . We except baby to be here by Christmas. And yes I know u/'s can be off this is my 4 and they were off 2 lbs a piece with my others we are expecting a 10 lb baby. And they were saying 2 lbs less with the others who's weights ended up being 7.13,8.3,9.2 per u/'s they said 6-7lbs each. We are very excited and are taking it easy for the next 6 weeks. We want to make it to 37 weeks.