is it safe to have inermates with your partner

It depends. When I was pregnant with my first child things changed position a little and it was very uncomfortable for my first trimester. But after that it was just fine. I didn't have any discomforts during my second pregnancy and now that I'm 26 weeks into my third it's only now becoming a little uncomfortable because my belly is big and it's awkward.

The only thing you can do is try. If it's uncomfortable you can find other ways of being intimate. It's an important part of your relationship and it's a big deal for men, so you'll have to figure something out. 40 weeks is a long time for him to have to handle things himself, you know?