Im 16 years old and i started taking ortho tri cyclen lo two months ago. me and my boyfriend did have unprotected sex, but we were always careful to use the pull out method. we started this during day 9. I missed my pill 2 times right around my period(i did not have sex around this time) It came early and lasted nine days. Now i'm three days into the sugar pills and no period. should i be worried?