Getting so big so fast

Ma

So this is my 2nd and my 1st is one. I've noticed I am getting big A LOT faster than with my first, I'm as big as I was at 30weeks with my first and I feel really bad because I don't want to feel worried about my "body getting ruined" because the health of the baby is far more important, but I was doing just fine at first than once I hit 18 weeks it all went downhill from there. It's like my belly is getting bigger by the day! I'm gonna start exercising again because I stopped for awhile due to really bad morning sickness. I know non of you are doctors and I am gonna speak to my OB about it at the next visit, but in the meantime has this happened to anyone else?