I'm 18 year old boy and my GF is about 16 year old. We had sex on 11 Jan and we used condom and also this is our first sex. But her period was a bit late. She always have her periods 5 days earlier and she missed 1 day of her periods. Today, it's 31st Jan, and her period was late. Today we also used Prega News to test and the result is Negative. But her periods are late. We are afraid. Pleaaassseeee help me, is she really pregnant?? Plz tell me.