Ladies hopefully not TMI but I want to have some fun with my hubby it has been a long long time but…

Ladies hopefully not TMI but I want to have some fun with my hubby it has been a long long time but I am worried at the same time cuz my last baby was 6 weeks early due to sex and I just don't want that to happen again I'm only 28 weeks also what would be some positions that would be ok with the big belly in the way?