If the menstrual cycle is usually regular, 30 days to a menstrual period, the 24th of last month to menstruation, ovulation is in the 6-13, a total of 8 days of time, the time of ovulation is about in the 10th, so in the clinic if you plan to get pregnant, in this period can be scientifically coitus, for example, coitus 3 times, each time the time to be spaced apart, the chances of getting pregnant will be particularly large. In addition, the coitus must pay attention to hygiene, and do not stand immediately after coitus, to lie on the bed to rest for an hour, the semen will not be a large number of discharged outside the vagina, so it will increase the chance of pregnancy. If there is no plan to get pregnant, if you want to have sex during this period, it is recommended that you use a condom, and use a condom during the whole process of sex to avoid the possibility of pregnancy.