Absolutely, Confused. Pregnant?

My last period was from October 26-30th, I started to have a light "period" on the 18th of November, it was pink for about two days, turned brown for three more days and this was all really light, only really when I whipped. On the 6th day it was a dark reddish, but only for a few minutes then back to brown. I spotted for nine days, and my period still wasn't due for another 2 days after that. My periods are usually extremely heavy and painful, this spotting was nothing like it. I feel weird all the time now, I have slight heartburn that goes full force sometimes, weird headaches, cramps in my legs which is so unusual, i get dizzy once in a while, my sleeping habits are so weird i can take a five hour nap an then sleep all night and still feel so exhausted the next day and other times i take a two hour nap and not sleep for hours and hours after that, i feel like I need to stretch alot, once I had a painful stretching feeling in my right side for a minute or two, I feel nauseas randomly, and throw up in my mouth alot. I took one test the morning of the 4th day of my missed period (December 1st), it was negative. I feel SO off lately. Oh, and I'm pretty positive I did have sex some around ovulation that month.. Help?