sex is different for me now

Before I became pregnant I used to crave sex and my bf and I used to have sex so passionately and a little rough.. it was hot. But since I became pregnant I can't take it like I used to. I'm not sure if I'm uncomfortable or worried it's hurting my baby (I know it's not, but the thought is there) and we hardly ever have sex now because I'm just not able to "perform" like I used to. I don't even crave it anymore, instead I try to avoid it at all costs 😕 Anyone else have this problem or have any suggestions?