My bff was 230 pre pregnancy. She gained 17 lbs the entire pregnancy & you can't look at her pre pregnancy pictures & the day before she had her son's pictures and tell a difference! She looked the same throughout her entire pregnancy.. But she also never lost weight after delivery, either.
I wasn't 200+ but with my son I was 173 when I got pregnant (I'm 5'2.5 so I look fatter). And I started showing around 23w. With my second I was 185lb when I got pregnant and started showing around 17w. You could actually see something at 14w if I held my shirt tight. But I don't count that. Lol
I was 99kg (probs about 215lb) when I first got pregnant and I started showing at about 25weeks. It was always difficult to tell beforehand though as I have a little "pouch" and I didn't feel like I looked pregnant. In my pic to the left (hopefully it's the right one lol) I was 31 weeks pregnant and showing a lot but sometimes I still felt like I didn't look pregnant here. I just wore certain clothing like over the bump leggings that emphasized on my bump. You will soon start showing so don't worry!! And if people ask where your bump is just make them feel awkward for asking, they won't do it again hahahaha