My period two weeks ago was very light and very dark and for the following two weeks I've had steady black discharge. It's pretty light, I don't need more than one or two thin liners a day. I know that if it's right before or after a period, it's probably old blood, but is there any reason that it would last so long? I haven't had sex in about eight months, so I highly doubt it's an STD or pregnancy. I was on birth control for about a year, and I stopped taking it in November of last year, if that makes a difference. This did happen to me once before, a few months ago, and eventually it just stopped. Any possible explanations? If nothing else, it's just getting very annoying. -.- Thanks!