According to a study published in the New England Journal of Medicine, a majority of pregnancies result from having sex in this period. The likelihood of conceiving is 10 per cent five days before the ovulation and 33 per cent on the day of ovulation. Surprisingly, the chances of conceiving drop to zero a day after the ovulation as the egg can only be fertilised between 12 to 24 hours after being released from the ovaries. After this one has to wait for the next ovulation cycle to try to get pregnant. In most cases, lack of knowledge about the ovulation cycle and signs of ovulation creates an obstacle in conceiving.