Happened to me also at 16 weeks.My bump came around 18 weeks. I'm now 20 weeks and that bump sure ain't going anywhere.This is my first child also.
I'm 16 weeks n 2 days today with my first baby. Extremely excited and ready to find out what I'm having but my Dr said I had to wait until my 20 weeks
This happened to me too. You just don't have any excess room for food because it's all uterus/baby so when you eat everything just goes forward. It will keep happening but the bump will become more permanent with time.