The ovulation test paper will appear weakly positive immediately after the egg is expelled, because the ovulation test paper is to check the luteinizing hormone in the body. A positive or strong positive ovulation test paper during ovulation indicates that the luteinizing hormone is relatively high and ovulation is imminent. Normally, 24-48 hours before ovulation, the luteinizing hormone in the body can reach its peak and it is easy to have a strong positive ovulation test. After the follicles are expelled, the luteinizing hormone in the body decreases, making it easy for the ovulation test to appear weakly positive. If you are planning to get pregnant, you need to have intercourse when the ovulation test turns from strong positive to weak positive, which is when you have the highest chance of getting pregnant. If you drink too much water, it will cause dilution of urine, which will easily lead to a weak positive result, and the poor quality of ovulation test strips will also affect the test result.