Am I alone on this

So I’m 38 weeks pregnant & honestly haven’t been in the mood to have sex with my husband, but I feel guilty because I end up masterbating in the shower. We’ve tried to have sex but it’s so uncomfortable & ive been getting pains down there so I don’t want to really try. Am I being selfish? Should I be doing this while I’m so far along in my pregnancy. He doesn’t force himself on me he understands that I’m tired & in pain. But I still can’t help to feel guilty. I think a major part of why I feel guilty too is because I do it while watching lesbian porn. I’m not bi & I’ve never been with another female. For some reason that’s what turns me on right now.