There is a certain time during the menstrual cycle when the woman is most fertile. This however, depends on the life term of both the egg and the sperm. It has been established that an egg can live for as long as 24 hours, while the sperm can stay for longer inside the woman’s body. Therefore, in a 28-day menstrual cycle of a woman, ovulation will begin on the 14th day, and she might conceive between the 8th-19th days of the cycle. For women with irregular menses, the exact day of ovulation is difficult to determine.
Reports suggest that there is a ‘fertility window’ within a period when women are most fertile. The fertility window, say experts, is five days before the process of ovulation and two days after ovulation. This is the period when a woman is most likely to conceive if she has had intercourse. However, this is just estimation, and not a conclusive theory.