When forgetting the time of menstruation, women who are in the stage of preparation for pregnancy can clarify the ovulation period in the following ways to increase the chance of pregnancy. If a woman is already pregnant and does not know the exact time of menopause and time of conception, she can calculate the number of days and time of pregnancy by checking the HCG, according to its value or the size of the fetus by ultrasound.1, leucorrhoea: when the leucorrhoea of a woman becomes thin and transparent, it may be in the period of ovulation, when a woman can have an increase in vaginal secretions, secretions can be stretched out, and if there is a need for pregnancy, a woman can have intercourse in this period, the chances of pregnancy can be increased.2, basal body temperature: measure the temperature for several days in a row, if the temperature is measured, it may increase the chances of pregnancy. The chances of pregnancy can be increased; 2, basal body temperature: measure the body temperature for a few consecutive days, if there is a morning temperature rise is the beginning of ovulation, until the temperature drops is usually the time of menstruation; 3, ovulation test paper: with a clean, dry container to collect urine, urine within a day can be detected, but usually do not use the morning urine, in the process of continuous several days of testing, should try to test the same time every day the same time of the urine samples, if there are two colored bands and the detection of the test, the test can be done at the same time of day. If two colored bands appear and the test line is equal to or darker than the control line’s apparent color, this indicates that peak LH has occurred, indicating that ovulation will occur within 24-48 hours. If there is only one red band in the control area or the test line is lighter than the control line, the presence of one red band, i.e., the control line is colored and the test line is not colored, indicates no ovulation.