The 10 days of intercourse, 5 days before and 4 days after ovulation, plus the day of ovulation, are the easiest time to get pregnant. The easiest time to get pregnant is 2 days before and 1 day after ovulation, and these 4 days have the highest fertilization rate. But ovulation is not easy to determine. To measure the temperature of your armpits with a thermometer, start measuring your temperature at the beginning of the month. Every morning after 6 hours of sleep, do not do any activities when you wake up and take the temperature of your armpit. If the temperature is rising, it means there is normal ovulation. Another way is to push your period forward 14 days, this time is the time of ovulation, so to prevent pregnancy, it is best to determine the time of ovulation, according to this time to arrange intercourse.