Help! what is going on?

Ok I stared spotting 8 days before my period, it stopped after. Then I was 3 days late for my period and the I started spotting again. so I was like ok here is my period. That was 2 days ago and I haven't even bled enough to fill half a tampon. Usually when I get my period when it starts it's full force. I'm gonna make an appointment tomorrow but I thought I'd ask on here before I'm seen . Also I've taken hpt and they are all negative so I'm not pregnant. And I don't take birth control. Has this happened bro anyone else?