I re-started the pill in December 16. It is a tri-phase pill. On Jan 2 (middle of my third week/week before placebo week), I started getting light brownish discharge. My boyfriend and I have been using the withdrawl method since I'm on the pill. Since Jan 2 til now Jan 10, I've had the continual light brownish discharge, but no period this week (even though this is my placebo week). What can this be?