Sex during pregnancy

How do ladies feel about sex and being pregnant? I'm just not even into right now =/ even though my bf is very sexual. I just dont get the urge at this point. My other pregnant friend though has sex about 3 times a day maybe when I get further along I'll feel that way lol I just feel bad for not meeting his sexual needs. Also I can't do it doggy style it just hurts... I'm guessing because all the pressure put on my uterus.