I am trying for baby boy. 9/18 -today is my 12th day and opk is +ve in the morning. when will be my ovulation occur. my periods are accurate 28days.?

24 - 36 hours later: Ovulation usually occurs 24 - 36 hours after an ovulation predictor kit (opk) goes positive. Days 13 and 14 are your best days to get pregnant. If your partner has a normal semen analysis, have intercourse tonight, tomorrow and the day after. There is no way of increasing your chances of a boy by timing of intercourse though or any other 'at home' method ... Best wishes.