Thank you for the question. First of all, PlanB is a large dose of progesterone that acts by delaying ovulation and thickening the cervical mucous. It is very effective at preventing pregnancy, especially when taken in the first half of a cycle. It also leads to breakthrough bleeding (often as a brownish discharge) AND a delay in your next period. So what you are describing is normal and your cycle is going to be very confusing over the next month. Given how much progesterone you have taken, I guess that I am not suprised that there could be some discharge from the nipple. This is called galactorhea and I imagine that it too will resolve as your cycle normalizes. I think that this is of low concern. Finally, you need to take pregnancy tests now and again in one and two weeks to rule out pregnancy. You need to find a form of birth control that works for you as PlanB is not going to work as a form of reliable birth control. I hope that this helps and good luck! Dr. Tim