Before my BFP i was working out regularly. I would walk my dogs for 45mins twice a week, do exercise bike for 30mins three times a week and an aerobics dvd 4 times a week. And strength training with weights. Is it ok to continue doing all these things in the first trimester? What should i be worried about? Overheating? Can i still do sit ups? I would really like to keep pregnancy weight down and tone up my arms and legs.