pregnant???

So I've been 2 weeks late on my period my last period was Sep. 17-21 and my period was supposed to start on Oct. 15. I've tested on the 8th day I was late and got a negative. I've been having every symptom of pregnancy btw. On my 12th day late I had sex, when I went pee after I had a little bleeding.. since then I've been bleeding and having some tissue shedding. It's very inconsistent, it's super light then all of a sudden I will get a burst of bright blood. I'm so confused and I took a test last night and it said negative but I still feel like there's a chance I could be pregnant. Am I crazy??