So, here's the deal. I had a period in late October, around the 20th and then to my great surprise, I had another one about a week and a half ago. Then yesterday I started bleeding again! I have always had regular periods and have never encountered something like this. The only thing I have been doing differently is taking doxycycline for a really nasty upper respiratory infection. I still have not completed the regiment but I have been taking it for over two weeks. I am not taking any kind of hormonal birth control so I know its not interference with anything like that. Just for good measure, I took a pregnancy test to make sure that I wasn't having a miscarriage and it was negative. What gives?! Should I take another pee test to be positive?