About 4 1/2 to 5 months you'll start to balloon out.
When you are around 20 weeks, the top of the uterus should be felt just at the umbilicus (belly button). Perfectly normal to not feel pregnant right now. Consider yourself one of the lucky ones! Best of luck to you and your pregnancy! tmv
I am 4 months and 1 week pregnant and am just now starting to feel pregnant. I feel the baby move well flutter and thats about it. My stomach isnt hard either. It takes time dont stress about it, its normal not to feel pregnant.