Postpartum bleeding help!

So I’m almost 13 weeks post emergency c section. I was cleared for exercise at my 6 week check up, started going to the gym around 4 weeks ago. So I was on my period when I started so this is why I’ve just started noticing.. it seems like everytime I go to the gym (only light exercise and no tummy stretches etc) I start spotting, but on the days I don’t go it stops, I literally just noticed this, not sure if I should see someone incase? I have no pains or anything that indicates anything is wrong?