I've been on Ortho Tri Cyclen Lo for about three years and haven't really had any issues with it although I am concerned now. I'm in my fourth day of the placebo pills and I still haven't gotten my period. My breasts are tender, but I have no cramping or anything. I'm concerned because I have recently become more sexually active with my boyfriend. We don't use a condom for the first five or so minutes, but we use one until the end after that. I have taken my pills everyday around the same time just as I always have and haven't missed one. In February I skipped my period and then in March I got my period before the placebo week even started. Could it be possible that skipping the period in February messed me up for this month? I usually get my period during the third pill so I'm not really sure why it hasn't come yet. I realize there shouldn't be much concern if I take my pill on time, but I'm still curious.