Hi, I'm 18 years old and my period is two and a half weeks late. Last month I drank lemon juice on the first day of my period because I heard it would make your period lighter, and my period completely went away and hasn't come back since. I'm on a low-dose birth control and am pretty good about taking it, but might have missed a day. I'm very sexually active. Could I possibly be pregnant, or is my missed period related to the lemon juice?