Hello, I have gone through the query and understood your concern. Firstly, additional protection is mandatory during the first three cycles of pill usage in order to prevent failure. Secondly, your chances of conception are almost nil as you have taken additional protection within the stipulated interval after the intercourse. The milky discharge can be due either to the high hormone content in the pill or as a consequence of the hormone oxytocin released during the act. You may see some breakthrough bleeding in the next week and your next natural period may get delayed by a week or two. So, please make sure you see a specialist if you become overdue by ten days. Hope this helps.