I lost my virginity shortly before New Years and we didn't use any protection. I still was on my period at the time, but a day later my period was over. Now it is nearly 3 and a half weeks later. For several days now, I have noticed myself urinating more frequently. My breasts are much more sore than they usually are when I have PMS. The past two days I have become really fatigued, and at one point felt light-headed. I have been researching online but really can't tell the difference between PMS symptoms and signs of early pregnancy. I'm a little scared, but at the same time, hoping that I AM pregnant. Is it really possible?