I'm glad you've talked to your OB/GYN. it's always good to talk to a professional about things like this. Occasionally, I have experienced some bleeding after intense workouts. My doctor didn't seem concerned either so I haven't been worrying about it.
If you do a google search, many women seem to have similar experiences. You might find these articles helpful. www.livestrong.com/article/375688-can-exer