With my first, I had a small bump at about 18 weeks. I didn't really pop until about 23 weeks though.
If you are bigger...it may be quite a while until you show. Everyone is different! Some people barely show at all and then some people look as if they have a beach ball in their shirt!
Women who have carried before usually start showing sooner. First time moms usually start showing around 18-21 weeks. Every woman is different.
This is my first pregnancy that I have made it far enough to start showing.. and I started showing at 15 weeks.
Some dont show at all! I wad hoping that was me but i started showing around 3 mos kinda looked like i ate to much tho ... lol. I am really small tho. My friend was over weight around 200lbs she started showing around 5 months. Everyone's different