5 days spotting

Hey ladies,
I've been spotting for 5 days. Started 2 days before my period was supposed to start. Nothing heavy enough to wear a tampon and only when I wipe. I NEVER spot before a period it always comes on full force. There has only been brown discharge  or very light pink. No red or fresh blood. I took a CBD test on Saturday the second day I spotted and it was negative. I've been tired,nauseous, had very little cramping as where my normal period I have servere cramps. Also my boobs don't hurt at all, and they always start hurting a week before I start. I have a pretty normal cycle anywhere between 28-30 days and It usually last 2-3 days.Anyone ever experienced anything like this before??