The Oddest Thing..

So these past few weeks I've been having cramps pretty much every day it seems, (about a week after my last period finished), which seemed odd to me because they were too early. My period doesn't start until Sunday according to this app, But yesterday morning I went to the bathroom and noticed a pink/brownish spot on my undies and when I wiped it looked kind of pink. The whole day passed and every time I wiped there after, it was clear. My period is never this early, it's always right on time. (My period is having a ball with me right now.) This morning I checked my undies again and on my pad, a small brownish spot, wiped myself and again nothing. So now I'm wondering if I'm actually on my period or not. I took a pregnancy test just to make sure and it came out negative. Wtf is going on down there? 😱