It is normally a case of finding a position where it does not hurt. Because of your pregnancy, he might be thrusting in the the "wrong" direction and he has to change his angle.

Does it hurt when you masturbate?

i've never done that before :S

When I have sex, sometimes its sore. Im not really sure why, but its not like a pain, its more like a discomfort or an awkward pressure on my lower abdomen when hes in.

no this is like pain on the sides inside. like somone is taking a brush inside and scratching me