Me and my GF had sex on July 23/24 and the condom broke and she was on her period (near the end of her cycle) The very next day she had taken the Plan B pill and had some of the common side effects like stomach pains and nausea. Those side effects subsided after a day or two. Since then she has been fine but today she freaked out when she felt a warm gushing feeling as if she started her period. She said the blood was brown and almost black and she is not due to start her normal cycle for almost 2 more weeks. First is this normal or common. Second how long should this last. Third is this her period or just another side effect, and fourth, She is due to have her birth control shot next week. Will this side effect mess with the shot or will the shot have to be delayed ?