Okay so I have been on my period for 8 days now...and usually it's on time. This time it was a week early and it's bad. I'm having really painful cramps...and a heavier flow that isn't progressively slowing down. Its like a medium flow everyday...sorry to seem graphic. I have been on the same birth control for 2 years. Haven't missed my pill. And last week I took 2 pregnancy test and both came up negative. I'm concerned because this hasn't happened before. Any ideas or what should I do??