My last period was December 21st 2012. It lasted until December 28th 2012. I had unprotected sex on January 4th 2013. He did pull out however I have yet to get my period. I've expierenced some symptoms, like the stuffy nose for week nine, gas, bloating, cramps, and back pain. I have felt queasy but not been puking. I did once though. I have taken pregnancy test that came up to be negative however it may have been to soon. I am 16, and pretty worried. Could I be pregnant?