Ovulation test strips are usually more accurate when used before ovulation, but the timing of ovulation is affected by a number of factors, so it is not possible to determine the most accurate time to use the more common ovulation test strips. If a woman has a regular menstrual cycle of 28-30 days, it is usually more appropriate to start using ovulation test strips on the 10th day after menstruation. Ovulation test paper mainly through the detection of luteinizing hormone level in urine, determine whether ovulation occurs, is one of the auxiliary means of female ovulation in vitro detection. By monitoring the fluctuation of luteinizing hormone levels detected by the test, peaks in the fluctuation can be found, i.e., strong positive signs, which means that ovulation may occur in the following 24 hours or so. If a woman has regular periods, she can use ovulation test strips on the 10th day after the onset of menstruation and monitor the test strips once a day to find that the test strips are gradually moving towards a positive sign. When the test reaches a strong positive value, it indicates that the woman may be about to ovulate. At this point, if a woman wants to give birth, she can increase the frequency of intercourse in order to improve her chances of conception. When using ovulation test strips, you should follow the instructions of the test strips, do not be too nervous, and relax your mood in order to promote conception.