So I'm 20 weeks& 5 days I haven't gained much weight. I gained 4 pounds then 2 pounds then lost 6 pounds and now gained 3 pounds... But the last time I had an ultrasound they say the babys growing healthy at 17 weeks n it measured 5.7in which is perfect..I'm waiting for Tuesday to have another ultrasound...I just feel chubby er don't really have that bump yet...is this normal??