C section pain and period.

It's been 6 months now that I had my boy plus the c section of course too. And I've been trying to workout I mean I do a lot I'm always on my feet. But I just finished my period and I got it again. It's not normal just spotting and the pains are from my back to the front of just a sore feeling like my last period. But my scar is very sore. I was doing yoga and sit ups for the first time yesterday could that be I pulled something or is that normal then again nothing is normal after having a baby. Lol