I cant be pregnant..right?

You should wait two more weeks and take another test. But honestly, you might want to go see an OB, it could be signs of something more serious that needs medical attention! You should go to an OB anyways now that you are sexually active, especially if you chose not to use a condom because you can get something like HPV that will need monitored. If you're choosing to be sexually active you need to be responsible about it. Good luck!