33 weeks only gained 6lbs but measuring spot on

So my doctor has never been concerned but it’s starting to seem odd to me that I’ve only gained 6lbs. Everyone I know and blogs I read people say they have gained 20-30lbs at this point. I was 5’3 and 154lbs when I got pregnant so yes I needed to lose a little before and I’ve heard that could be what’s happening is the baby is gaining but I’m actually losing weight but still I’m just looking to see if anyone is in a similar situation. It’s not like I’m a super fit person. I literally have been so lazy this whole pregnancy and I don’t work so it’s not like I’m running around all day. I keep telling myself to just be glad I’m lucky and am carrying so well but then my head gets going and worry kicks in again lol.