Walking squats certain yoga short bike rides but try to stay away from the running
You can jog if your doctor okays it. But everything ^^she said is good. I walk 20-30 minutes a day and bought a birthing ball its the same as one of those big gym balls and I exercise with that. They have videos on YouTube on how to exercise on them while pregnant.
If your a "runner" then you can continue running. I have 2 friends that ran til 5+ months. Check w doctor first though