Ive been on birth control for a year, and this month switched to a new kind. When switching, I did miss a couple days of the pack, and have missed 1 pill during the month (took it the next morning). The last week of the active pills, I started having a lot of brown discharge (old blood), and then into the week of my period, it stayed mostly brown with a little bit of blood. Should I be concerned of a medical issue or pregnancy? Or could this just be from switch BCs?