Don't stress. Some women hardly show until the last 3 months! My friend is 20 weeks and you can't tell at all. Every woman is different. Remember your baby is still very small and the extra "weight" is bowels and stuff.
No it nun to be worry about I felt the same way Cuz I was so small but now I'm 24w2d and I still didn't grow as much but my doctor said it only because I'm having a big baby
No your shouldnt be worried. Everybody's body is different. With my first I barely showed until 28 weeks and then it was almost like it was over night I looked pregnant finally. This is my second baby I'm pregnant with and I've been showing since 20 weeks and look much bigger than with my first (since my uterus has already been stretched out). Trust me its totally normal