A strong positive ovulation test is usually due to peak levels of hormones in the body, suggesting that ovulation is occurring or is imminent. Ovulation test strips detect the level of luteinizing hormone in a woman’s urine, and this hormone will only appear strong positive at the time of ovulation. Before and after ovulation, the level of this hormone shows a gradual increase and gradual decrease, so these test strips can be used to monitor ovulation and determine the time of ovulation to increase the chances of conception or can be used as a contraceptive. If there is no strong positive change throughout the menstrual cycle, it means that there is no mature follicle discharged this month, or the hormone level is low and cannot make the follicle mature, then you can go to the hospital in time. In addition, ovulation test strips have a certain margin of error and can be reused several times in a day.