this is my first month of bc pills, and I have been having unprotected sex. we used the "pull and pray"method. I am a week late now, and ive taken two tests. one the start of the week, and one just now. (thurs) and both are negative. so i'm about a week late. Im really not sure what to think. Pre-med classes dont tell you how to think through this one... thanks for any opinions.