As a rule of thumb you should never start any physical activity during pregnancy that you were not doing before you got pregnant. This German lady ran a marathon when she was 26 weeks pregnant but then she ran marathons all the time.
If you didn't do any physical stuff before pregnancy but would like to start for the sake of the baby then stick to walking, swimming (where the water gives you tons of support) and gentle yoga and pilates. Everything else, including stretching, dumb bells and push ups can be really dangerous as all your ligaments are currently loose to allow the baby to grow so you can put out muscles really quickly. If you have always done these exercises then keep going as long as you can but eventually that stomach is going to get in the way of push ups as you can't lie on your tummy after about 24 weeks. You might want to try them against the wall? Stand facing the wall, about two feet away, put your hands flat on the wall and push. Good luck!!
at 2:01 PM on Jul. 10, 2008