Ovulation test refers to the detection of the peak level of luteinizing hormone (LH) in urine to predict ovulation. A weak ovulation test is usually found before ovulation and after ovulation, while a weak ovulation test can also be caused by a failed ovulation test or a failed urine specimen collection. If the ultrasound shows that the dominant follicle is 18-20mm in diameter and the ovulation test is positive, 80% of ovulation will occur within the next 24 hours. When using ovulation test strips, it is important to follow the instructions strictly. The test can be done at any time of the day, and if tested daily, the test should be done at the same time as possible. Try not to urinate within 4 hours before the test and do not take in too much fluid as this may affect the test results. In addition, both spouses during pregnancy preparation should develop good lifestyle habits, eat a healthy diet and avoid bad habits such as smoking and drinking alcohol. Relevant tests should also be performed, including blood pressure, blood sugar, weight, liver and kidney function, etc., and any abnormalities should be dealt with promptly.