I play ice hockey and I'm currently trying to conceive. I plan on playing for the first 12 weeks as long as I feel OK. If it wasn't a contact sport I you could probably go longer, I've heard of athletes competing until about 5 month pregnant. I've even hear of a woman playing ice hockey until she was 7 month pregnant but I think that was pretty dumb on her part. I plan on lifting weights (while slightly lighter then I currently go, I lift HEAVY right now) for the entire pregnancy.