What is the reason why the ovulation test paper shows weak positive for 23 days? Ovulation test strips are a tool for detecting the concentration of follicle-stimulating hormone (LH), which can help women predict their ovulation period and facilitate pregnancy planning. However, if weak yang occurs for a long time, it needs to be taken seriously. So what is the reason why the ovulation test paper shows weak positive for 23 days? Let’s explore it from different angles. Physiological Factors First of all, the weak positive result of ovulation test paper for 23 days may be caused by physiological factors of women. In some women, after menstruation ends, the ovaries continue to secrete low levels of LH, which can cause weak results on ovulation test strips.