I have been on Mononessa for some time now (several months) I have on rare occasion missed a pill, but I always take it as soon as I remember. This last occurence, I missed it at 10:30 friday night, and made up for it around noon on saturday. I had unprotected sex that night, and took that nights respective pill, and have taken then religiously since. I took them pretty steadily before-hand as well. I'm on the third day of placebo pills, I typically start my period on Tuesday of the sugar pill week because I always start the pack on sunday. I overworry a lot, and I know stress can cause a period to be late. I just want an outside opinion on if I should be worried or not, because I haven't started my period yet, and its making me really worried.