Hi Lizzyym1993,
If you don't want to get pregnant and are going to continue to have sex often, I would suggest, using preventive measures from getting pregnant. Please see a doctor and discuss what is the best form of birth control for you. You probably are testing to early as to why it is revealing a negative result. The systoms you described could be other things going on with you besides pregancy. Since your cycles are normal, you if miss your next one, the chances are great that you could be pregnant. Please remember if you don't won't to be a parent, please don't engage in the kind of sexual activity that parents engage in.
Good Luck,
Faded Rose