Read your prob, on13th day your follicals became mature n you got shot of Hcg
. after shot of HCg ovulation occure after 36 to 4o hrs. so at that time you should do unprotected intercourse
. that is most fruitful day for you (15th to 17th day ).on that days there is more chance of getting pregnant. do not worry about white discharge, it occure due to hormonal
changes due to HCg. this is physiological .