so ive been on the pill 2 months. first month my period was on and off but secomd month it was normal. but I got my period 2 days ago again and today I had full black blood. not brown and yes clots. i was thinking maybe because I take my pill late almost every other day. I have 2 kids and home alone even with 5 alarm I take it late. what could this be I'm so scared. plus ive been having the worse lower back pain ever.