Spotting not pregnant or on period

I’m 17 and my period is very irregular I’m talking 80 days apart my last period was in March but I’ve recently been sexually active and started spotting a few days ago I’m not expecting my period until about next month (I skip months very often) any idea as to why this might be happening I’m not in pain my boobs aren’t sore and my appetite is the same I’m just ready scared someone please clear my mind