I had unprotected sex with my fianc� on my ovulation day. He ejaculated outside and I took unwanted 72 within 50 hours of sex. I am having very light brown colored discharge after 8 days of taking the pill and just before 4 days of my period. The discharge is on and off and would have been very light to notice otherwise with very faint abdominal pain. Could I be pregnant? Can it be implantation discharge as it occurred 4 days before my period and I took pill within 50 hours which could also be late. I took home pregnancy test today i.e. 4 days before my period and it came negative. Do I need to repeat it?