Spotting 7 weeks pp....what is it?

I had an emergency c-section 7 weeks ago. Husband and I waited 6 weeks to have sex and have only done it twice so far. I bled after my c-section for about 4 weeks.

After having sex, ive begin spotting. Enough that I’ve had to put in a tampon for the past 3 days. I don’t think it can be my period, as I am exclusively breastfeeding and the bleeding isn’t really enough for a period.

Any thoughts on what this could be or why? Thanks!