Postpartum period?

So I think I finally got my period 4 months postpartum and I’m exclusively breastfeeding my babe! I woke up this morning and started bleeding! It was heavy bleeding not spotting. I put a tampon in switched it out and put another one in about 4 hours later and I haven’t bleed since. That was a short lived period, I started my pop pills today also. Has anyone else had a period like that while breastfeeding?