pregnant or ??? PLEASE HELP

Okay. So I had my period two weeks ago, it was a little weird and 3 days late. I went to the OB because I had passed a huge clot unlike I ever have before and my bleeding was weird, all my hormone levels came back good and The PT was neg. but this was on day 2 of my period that I had went to the OB. Now, almost two weeks later I started spotting last night brown and rusty red and now I'm am heavy bleeding, please  help!! I've never experienced bleeding abnormally and I'm not on BC!