Well the only way of knowing is to take another preg test.
If still negative, you're most likely not pregnant. See, if you worry too much your body can delay your period, making you think you might be pregnant. So just relax and try not to stress out about it. Also you may want to consider a form of Birth control afterwards until you are ready to have a baby (condom, pill, nuva ring, IUD etc)

If it's positive, go see a doctor with your BF and discuss how you will be handling this.


Good luck