Sex positions while pregnant?

Im currently going on 28 weeks pregnant with my second little one and this pregnancy is of course different from my first. Well i notice i have a hard time finding a comfortable way to have sex. I was normally ok on my back but belly just seems squished lol plus my legs habe been cramping up terribly. I tried on top and when i "ride it" my belly feels wierd and cant even do it like i noramlly could :( i just want to be able to do it without feeling like a "major pain" with my SO. Its like a total turn off when this happens. Any suggesstions???