My boyfreind and I had Sex the week after my period, unprotected, I was suppose to get my period on 11/22 and i never got it. i have had my period since 5th grade and never missed or been more than a day late i am over a week late. This morning 11/28 i have had cramps but not as bad as i normal get them, plus very light brown spotting with 1 to 2 drops of light pink blood. I get back pains every once and a while. I don't know if i am pregnant or what to do?