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If there is no wound on the bloody sanitary napkin, then there is usually nothing wrong. Next time, try not to touch other people's bloody sanitary napkins.
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It's okay, it's okay, you have to pay more attention to hygiene.
How old are you? If you are older, it may be that the vagina is looser, and if you are younger, it may be that the menstrual blood is too small, so you should see a doctor anyway.
Vaginitis, go to the hospital for examination and treatment in time.
How can it be so diligent, the girls have changed it before going out, and they don't need to change it when they go to the toilet, mainly to see if there are blood stains on the sanitary napkin or pads. If so, of course you have to change it. Otherwise, it's not comfortable. Of course, it's all about comfort
It's up to you, but if you're a student you can change every two hours.