I had unprotected sex on the first day of my period. My Periods are usually 8 to 10 days but they were for 5 days this time because I was asked to take "femilon" an oral contraceptive for 21 days to regularize periods. I started the medicine on the second day of my period, the next day of unprotected sex. I'm having spotting, its the 13th day of my cycle. I'm confused if this is mid cycle spotting or a sign of pregnancy. Because pregnancy is a huge problem for me at the moment.