Ovulation occurs

(Before 14 days of the menstruation) (27- Shaw's 14th)Ovulation is estimated to occur 14 days before the first days of the succeeding cycle* Ovulation occurs when the ovum surrounded by the corona radiata escapes out of the graffian follicle. It is quickly picked up by the tubal fimbria which hugs the ovary at ovulation* The peak level of 75 ng /ml of LH is required for ovulation.* Normally, one single ovum is discharged from the graffian follicle. However multiple ovulation can occur and results in a multiple dizygotic pregnancy.