I've been on birth control for 4 years. Last month, I think I took one pill late mid cycle. I had taken my pills steady for 7 days when I had sex without a condom on the 3rd week of my pill pack. The following week should have been my period. Usually, my periods are on time. I normally have light-moderate flow and bad cramps. This time, I had mild cramping and what looked like the slightest bit of brown blood on the first and last days of my cycle. It was almost not noticeable. Following the last day of what I thought was my cycle, I've had unusual discharge. It's yellowish with a strong odor. The past three weeks, I've been under significantly more stress than I am used to. Did I miss my period? Why is my discharge so unusual? Could I be pregnant?