What in the...

I’ve been spotting lightly for almost two weeks now, with it getting just a bit heavier every once in awhile. I’m not suppose to actually start for at least another week. It’s getting to the point where it’s making me crazy and where getting intimate with my SO isn’t as often as I’d like it to be. Any ideas what could be going on?

I did take a test during the first few days and it was negative.