Unprotected . possibility of pregnancy?

I am 17, had unprotected on christmas. I'm not here to hear your lectures on usage of protection. It was just one of those nights. I am fully aware of pre- and how it can get you pregnant. Just want some opinions. A week after (during that week I was im Mexico) i I started to feel queasy with diarrhea and fatigue. I umed that was from returning from Mexico and the water there and what not. As of now, no queasiness,no swollen , no fatigue, basically no symptoms. However I seem to have to urinate more but I think its me being paranoid. No missed period yet I'm waiting for mine , it should come in the next couple days. Opinions?