Big baby or early baby.

Ok so at 31 weeks my belly was measuring 2 weeks ahead so my doctor order a ultrasound so at 33 weeks on the ultrasound my baby measured 5lbs and 6oz. Well today at my 35 week appointment she measured my belly and it's now measuring 41 weeks so we will be having another ultrasound at 37 weeks. I never had this problem with my son he measured perfectly on track at every appointment.

So my question is have this ever happened to you and what was the out come of it all?

Also does this mean my baby is really big or that she might come early??