I would not be embarrassed about it, it's perfectly normal everyone has sex and it's an important part of a relationship. Not that I would jump on the bus to have a chat about it with strangers, but friends not a problem.

I tend to think everyone finds what is comfortable for them. Here are some good ideas (not sure about the one on the chair)
https://www.babycenter.com/101_pregnancy-sex-positions-illustrated_10408539.bc

I have to say a cuddle and a vibrator was the only option towards the end.

Oh and talking with my friends, seems a lot of men are really turned on by the whole pregnancy look, despite feeling quite bovine.

I'm not pregnant at the moment, but I have had 2 kids already. Something I never asked other mothers was what sex positions they enjoyed during pregnancy? It's very embarrassing to ask face to face (and even online - sorry!) but I'd appreciate it if people could respond - not least because I know lots of expecting mothers are wondering the same thing!