My periods are always irregular, but I've been on progestin only birth control for two years and ever since, even if they're a day or two off they still happen every month. However, I haven't had a period since November 2014. I took a HPT one week after my period was due in December, and then another three weeks after my period was due. Both were negative. However it is now February 3rd and I've yet to have a period! I have no thyroid and I was recently diagnosed with PCOS, both of which I now know have caused my irregular periods in the past. However, as mentioned, they've been fine since I started BC. The longer I go without one, the more anxious I get. I know it could simply be my medical issues, but I also read about women having negative tests even if pregnant. I can't afford to keep wasting my money and I'm not in a position to go to a doctor right now. I don't know what to do or how to calm down about the situation.