Try not to worry about what others say, for some reason everyone has an opinion....grrrrrr. I got a lot of that too when pregnant with DS, my MIL even had me stressed for a week as she said the baby must be lying the wrong way & that's why I was so small. Everyone is different & that's what people need to realise before opening their mouths!!!!
I spoke to my midwife & she just laughed, then went on to say that as I was young & it my first the skin is still very tight & it wont pop out right away.........& that next time around I won't be able to hide it past 12wks!!!! WRONG!!! I'm now 14wks with my second & hardly have a bump.

When people comment on how tiny I am, I just kindly remind them its prob because I am throwing up 24/7.......usually stops the conversation.