cryptic pregnancy???

So I had unprotected sex back in August. I'm not on any form of birth control and my period is yet to come. I took a pregnancy test in September and it was negative. In mid October   I took one and it was faintly positive. Due to our disbelief i took one more two weeks later and it was negative. I have not taken another test since then. Unfortunately I can't go to the doctor unless it's very very crucial. I came across an article talking about cryptic pregnancies, and how having a positive pregnancy test and then negative weeks later has correlation to cryptic pregnancies. This states I don't have enough of the hormone to prove that I'm pregnant. I just don't know if this is all in my head or what. It's December and my period is 132 days late, and I've never ever missed a period this long. There's no unusual stress, diets or weight loss either. What do you think?