Hello, I would be happy to help you with your question.
If you are having regular cycles, and knowing that most women ovulate on day #14 (counting the first day of your period as day#1) then timed intercourse results in pregnancy
about 15-20% of the time, per cycle attempted. So, the chance of pregnancy in your case is not that bad. The light discharge might be the beginning of a cycle or related to implantation
bleeding with a pregnancy. You need to check a pregnancy test now and repeat it in one week.
I hope that this helps and good luck!