Bleeding During Exercise After D&C

I found out that I had a missed miscarriage two weeks ago today, and then a suction D&C; two days later. My recovery was fairly painless, barely any cramping, bleeding was very light. I took a week off from any real physical activity. After a week, my husband and I went on a weekend getaway and did a lot of walking (15,000 steps per day) and I felt perfectly fine. Some dark spotting occasionally, but nothing worrisome.

However, on Monday, I went back to teaching one Zumba class and then went to the gym the following day for a Barre class, and both nights I was shocked to see significant dark red bleeding during the classes and after for about an hour. The next day it would lighten up, but I took tonight off from exercising. My doctor never said anything about not exercising for 2 weeks - just no sex, tampons, bathing, swimming. I have a follow up appt this Friday but has anyone else experienced this? Did I push myself too early or is this normal?