Could I be pregnant, or am I just worrying? Really looking for some input.

My period ended on the 10th of November, and I finally got to visit my fiance in new mexico (he's working an out of state contract) and we had sex that whole weekend. He came inside twice on the 13th, but I know it was right before my fertile window. But as of about a week ago, first my boobs started getting really sore.. and not like when I'm getting ready to start my period, but as in the sides and bottom of my boobs and even my nipples are sore. I've also slept more in the past week and half or so, than I feel I might have ever slept in my lifetime. I'm ALWAYS so exhausted. I take like 3 naps a day, and fall asleep before 9pm, when I'm usually a night owl, and can't sleep for any sake. Then a few days later, I started getting extremely conjested..still to this day, as well. The other night I drank only 6 drinks and 3 shots of whiskey, which normally wouldn't even affect me, and that night I ended up getting sick off of them. And then today, on the day of stuffing our faces with food, I can't even eat a cherry tomato because it tasted horrible (when tomatoes are my favorite,) and everything made me nauseous. Now my period isn't suppose to come until around the 4th of December, but I did take one test the other morning and it came up negative. Also, I've had two just down right bizarre dreams in the past week, and I never remember my dreams usually. So my question is, could I be pregnant, and it just be too early to show on a test, or is this all just some weird coincidence and I'm syking myself out with worry over nothing??