Quick questions for pregnant women

I have 2 1/2 more months left in my pregnancy. I am starting to get uncomfortable with this huge mass protruding from my stomach. And my back is starting to hurt a lot after I've been on my feet for too long. I want to continue working out (I have been kickboxing, taking step class, swimming and walking 2 miles) these last 2 months, but can't continue what I'm doing... other than swimming of course. Any suggestions? I'll take them all!