Ovulation test paper has been weakly positive after ovulation, the following conditions may exist: 1. false positive. The sensitivity of ovulation test paper is not high, and its test result is affected by the test method and urine cleanliness, etc. It is weakly positive; 2. Pregnancy. Ovulation test paper is mainly used to monitor the day of ovulation through the detection of luteinizing hormone. After pregnancy, the hormone level in the body changes and the ovulation test paper is affected by it and is weakly positive. You can go to the hospital 10 days after intercourse to draw blood to measure HCG to rule out pregnancy; 3. Endocrine dysfunction and hormone secretion disorder can affect the ovulation test paper results; 4. Ovulation test paper quality problems, such as expiration, humidity and pollution, can lead to inaccurate results. Ovulation monitoring by ovulation test paper alone is not very accurate, it needs to be combined with ultrasound to monitor follicles.