I've been ovulating for 4-5 days and i have not gotten my period yet. how long before ovulation does ones period start?

Menstrual cycle: A usual cycle is 28 days, with ovulation in the middle. Your period is called day 1.

12-14 days: Ovulation, which is when the egg is released from the ovary, lasts one day (though the symptoms can last longer). This typically comes 12-14 days before the next period is due. The time from the period to the next ovulation is more variable.