Yes, you can and you should! This should be said to all of you potential moms out there. Weight training is extremely important to get back to or keep your pre-pregnancy weight. If you haven't started training before you became pregnant, it's not too lage! Despite what some may say about training while you are pregnant, there is no reason why you shouldn't UNLESS told so by your doctor. The more muscle you put on your body, the sooner you can lose the baby weight.
You may not be able to go long, but you should go hard!