Unusual AF

Autumn

So my cycles are regular when they start. This cycle was a little different. Four days before my cycle I was experiencing back pain gas and slight cramps. The day before expected AF I experienced cramping and brown thick discharge as if AF is coming the next day which was day 1 I wore 1 pad never got full and it was dark blood. Second day I wore one tampon third day only tiny drops of brown blood but nothing to wear a pad. Anyone experience what im going through. What was your outcome.