Measuring ahead!

Taylor • Having my first baby, a little girl December 2016❤️❤️
I am all nervous about my measurements. I am 24 weeks and 2 days. On my last 2 ultrasounds baby has been measuring a week ahead. They say that's no big deal so I'm good with that. But then at the last appt she did my fundal height measurement for the first time and she said I was 2-3 weeks ahead and we needed to monitor that. I started this pregnancy overweight but haven't gained anything yet. Has any one had this happen? Did your due date stick? Was your baby a healthy weight?