Rough sex during pregnancy

Hey ladies I have a question. I’m a first time mom here and my husband is wanting to have really rough sex, to the point he wants to try and fist me (sorry tmi) but would that harm baby if it were to happen?? I’m just so worried something could hurt baby because we tried for over 3 years for this little miracle. Please, no judgement either on my sex life. I’m just really curious. Thank you I’m advance!