In a 28 days Menstrual Cycle, Egg is released on 14th Day(once in a month). 3 days before and 3 days after 14th day (11th to 17th day) is known as Fertile Period
. If you avoid these days, you can avoid pregnancy
. Other method is called Coitus Interrupts means pulling out genitalia just
before Ejaculation of sperm. There are more chance of pregnancy
in this method.