Help!!

9ish weeks PP. Raging diarrhea, weird discharge that's dark, (not blood, but like a dark yellow/white maybe with a hint of pink??) And crampy. Am I already getting my period? Or should I be worried?

If it matters: i'm exclusively breastfeeding, no pumping or bottles, had a vaginal birth no meds. Haven't really had sex yet.. we kind of tried but I had to stop after a couple minutes and couldn't even get it all the way in.