Best time to get pregnant from Hi9 by Dr.Rooma Sinha, Gynecologist, Apollo hospitals The best time to get pregnant. You're most likely to get pregnant if you have sex within a day or so of ovulation (releasing an egg from the ovary). This is usually about 14 days after the first day of your last period if your cycle is around 28 days long. An egg lives for about 12-24 hours after being released.