In healthy couples under age 30 who have sex regularly, the chance of getting pregnant is about 25 - 30% per month.A woman's peak fertility occurs in her early 20s. After age 35 (and especially 40), the chances that a woman can get pregnant
By having sex at least every 3 days before and during ovulation the chances of fulfilling pregnancy increases. A woman's egg can only be fertilized by the sperm for a few hours after it is released. It is said to have sex at least every 3 days before and during ovulation is that before ovulation sperm can live inside a women’s body for at least 3 days.
Ovulation occurs about 2 weeks before the next menstrual cycle (period) starts. If a woman gets her period every 28 days, the couple should have sex at least every 3 days between the 10th and 18th day after the period starts