I'm sixteen, I lost my virginity on November 13th we used a condom and checked it for holes filling it with water, he also pulled out before eyaculating. The same thing has happened another 2 times. My last period ended before the 13 of November, I don't remember very well. It's December 29th and I haven't gotten my period. Should I be worried? I'm scared and I don't know if it's just my nerves that keep on delaying it.