I am 8 weeks pregnant, and ever since I became pregnant I have not been able to orgasm during sex. We aren't doing it any different than we usually would. I don't know if it is just because my sex drive has went down, we were having sex at least twice a day and now I don't even want to do it once a week, can someone please help me?

http://pregnancy.about.com/cs/sexuality/a/pregsex.htm

This may be a helpful site.