The monthly change of the ovulation test strip usually shows negative when the menstrual period is clean. As time goes by, ovulation will turn into weak positive, and after ovulation, it will become positive.

The ovulation test strip predicts whether ovulation will occur by detecting the peak level of luteinizing hormone. Usually, the test strip is started after the menstrual period is clean and continued until the next menstrual period arrives. The monthly changes of the ovulation test strip should be a step-like pattern. At the time of menstrual cleanliness, due to the relatively low level of luteinizing hormone, the ovulation test strip shows negative. As time goes by, the level of luteinizing hormone will gradually rise, reaching the highest level 36 hours before ovulation. The ovulation test strip will change from negative to weak positive and then to positive. The accuracy of the ovulation test strip varies from person to person, with the main influencing factor being the method of using the ovulation test strip. If the ovulation test strip is not used correctly, it will affect the test results. Women should perform regular testing every day during the period of trying to conceive. When it is approaching the peak, you can test every 12 hours until the peak level of luteinizing hormone is detected. Increasing the frequency of testing can improve the accuracy of the results.

If the ovulation test strip shows negative, it indicates that you are currently in the safe period. Generally, as you get closer to the ovulation date, the test strip will gradually change from negative to positive, and then slowly decrease to negative again when it reaches a certain peak.