*TMI PIC* 6 weeks postpartum...is this just discharge or a period? Thanks!

I’m exclusively breastfeeding and have been experiencing some cramps on and off, migraines, and an intense backache. Could this be a period? I thought breastfeeding delayed a period. My hubs and I have had sex twice in the last week. Could the discharge possibly be from that? It was lighter pink this afternoon and has been mucous like since I had my csection. I have had constant discharge since baby was born, but not this red and not with these symptoms. Not on BC yet. Thanks.