Please help me.

Ok so my last period was Sept 16-18 and it was all brown sludge. No blood at all. But I still had all the classic pms symptoms aside from cramping. It was very mild..almost hard to tell if it was even there. I thought nothing of it really and let it go. Well since then my boobs have gotten more sore as the days pass closer to this period (October 13). But the weird thing is after my last period my boobs never stopped hurting. It's been non stop. And they are growing. Which is weird for me bc I'm 24. They ain't grown in a while. I can't seem to eat enough food to fill me. And I've had very slight cramping in my lower stomach/pubic area. It's on and off. Sometimes it will be sharp others it's barely there. I thought I was pregnant since I've got all this and absolutely NO blood but when I took a test this afternoon it said negative. What's yall thoughts? BTW af comes tomorrow. ..maybe