sex was extremely uncomfortable for me and still is. but I also am having issues with my cervix. so we basically stopped for good. it won't hurt your baby, the womb is safe and it actually rocks them to sleep :) but if its uncomfortable I would talk to your boyfriend about it.
It doesn't hurt your baby.you cab do most everything when your pregnant even workout as long as you don't smack anything with your baby bump or smash it. Your fine have lots of sex while you can.