Not sure where you live and your weather, but spring is great for taking baby in the stroller. Maybe do some floor exercises when she is doing her tummy time. I really like the Sparkpeople 28 day challenge DVD. I started with the 30 min, but it gives you time to work up to it.
That being said, after awhile, it wouldn't be bad to give yourself a few moments to yourself. It's a nice release.
My baby is now a toddler and I exercise when she is napping or goes to sleep. That way I don't have to stop what I'm doing and can concentrate.
Enjoy it and congrats!!