I'm on Orthro tri-cylin lo. I've been on it for about 3yrs. I have never missed a pill. I'm always on schedule. I'm freaking out because I missed only (1) pill on Saturday and on Sunday I took two as the directions directed. When Monday came, I took the pill for Monday and I'm back on regular schedule. What I'm concerned about is if I should be worried? I had unprotected sex Monday and I was wondering should I be concerned?