Last week, I left my birth control pills at my school, and couldn't take them Saturday or Sunday. Monday when I got back to school, I took 3 pills at once, at a different time than the usual. I usually take them at 2PM but that day I took it at 8AM. That same day around 12pm, I started bleeding. Its been about a week, and I expected it to end, but it is still occurring. What do I do? Is that normal? Is there something totally wrong or should I be worried?