Sex in pregnancy

Is anyone else just not enjoying sex at all? During the first trimester I was ok, just worried about spotting slightly after, second trimester I had a trapped nerve in my back so it was pretty much non existent. My husband has been so patient and hasn't once bought it up and has just said if I'm not comfortable then we don't even have to think about it. We did it last night 30+3 and my gosh it was just so uncomfortable down below. I felt swollen almost, maybe I've left it too long since the last time and my body has changed so much since then? I'm not sure but it felt so painful until the last 2 minutes when I finally ended up enjoying it. How does everyone else do it??