Lately I have been trying to get my workout in before my husband leaves for work. But on the days when he has to leave by 6:45am, my poor sleep deprived pregnant body can't/refuses to get up by 5:30am. Instead I will do some cardio and strength intervals at home in my front room while the little one is still asleep. Although I did do one the other day when she was awake and she found it very entertaining. She especially loved the jump rope which made things a little tricky for me. She was actually a great personal trainer because she never wanted me to stop jump roping.
Here is an interval you can do with minimal equipment. I really am a fan of this kind of workout because you can get both the cardio and strength going at the same time.