Pregnant but want sex...

I need some advice or help finding a good position to have sex with my fiancé. I can't lay on my stomache or have him lay on me because it hurts my stomache (the baby) and he gets irritated that everything "hurts"...but I don't want to stop having sex with him because I feel like I'm abandoning him (since we use to do it a loooooot). 
What do I do?