My friend had a similar experience and she called the dr. and explained what was going on, and told the dr she wasnt sure but thought she miscarried, and he said unless she fees like it is an emergency, she doesnt have to go to the er and it can wait for a routine apt, and he ordered her blood work without her even being seen, to check her hcg levels and less then a week after the period/miscarriage, her levels indicated she was not pregnant. so you might just try calling your doc and seeing if he can order blood work and go get that done to see what your levels are, cuz...going to the er for a heavy period would be a little silly, but at the same time, if you feel like it is a miscarriage, its better to be safe then sorry. good luck!
It sounds to me like it is just after effects from the pills, especially if you were having bad side effects hilst on it. I wouldnt wait for two weeks to see your doctor. Id get yourself to the emergency room asap and explain your symptoms. If anything they will be able to tell you if your suspicions are right just by performing some routine tests.