When you can get a weak positive test during your period, it could be a weak positive ovulation test or a weak positive pregnancy test. There are two reasons for this, either the test paper is not working or the bleeding is not really menstruation. 1. Test paper failure: If you are really menstruating, you will not ovulate or get pregnant during menstruation, so if the test paper is weakly positive, it is possible that the test paper has expired or is of poor quality, resulting in test paper failure. 2. Non-menstrual bleeding: If the amount and time of menstruation are abnormal, we can’t rule out the possibility that it may be caused by ovulation bleeding or pregnancy-related diseases. (1) Ovulation bleeding: ovulation bleeding generally represents the situation of ovulation, after ovulation because of elevated hormone levels, may cause a small amount of bleeding, so the ovulation test paper will appear weak positive. (2) pregnancy-related diseases: if there is a pre-eclampsia or ectopic pregnancy, may also lead to abnormal bleeding, the use of pregnancy test paper may be detected weakly positive. The menstrual period can be measured weakly positive there may be other reasons, if you find anomalies, it is recommended to consult a doctor in a timely manner to identify the specific causes, under the guidance of a professional doctor targeted treatment.