everyone has been getting on my nerves telling me I have a tiny belly and that with one month left…

everyone has been getting on my nerves telling me I have a tiny belly and that with one month left till giving birth that I'm going to grow 10times my size and get stretch marks ect. first off I'm huge I can't see my feet I can barley move if I sit or lay down. second my baby is already measuring at 3/4 pounds so she will gain a minimum of 2 more till birth and that won't make me grow like people expect. it's my first pregnancy and no one knows what will happen to my body not even me. it's normal for me to be so "small" plus I try to work out and eat right so that helps. p.s no stretch marks so far all these mom saying I'll get them are just jelly. I don't mind if I get them but thing is I don't have them!