So about a month ago (feb 22) I had a one night stand. He told me that sex didn't happen, but I took Plan B just in case about 10 hours later. I was right during my time of ovulation, and I got a brown discharge for 3-4 days about a week after I took the pill. A week after that I got it again for a couple of days (March 9). I still haven't gotten an actual period, so did one of those count, or is there a possibility that I might be pregnant?