If you are 13 years old, you should pay attention to the following points: 1. rest, try not to take physical education classes, do not do strenuous activities; 2. do not eat spicy and stimulating food from the diet, and absolutely do not drink alcohol; 3. if the bleeding time is long, pay attention to whether there is anemia, when the hematocrit is below 10g, it already belongs to the anemia range; 4. there are various bacteria, mycoplasma, chlamydia in the vagina, bleeding time is easy to induce vaginal inflammation, so you should use anti-inflammatory drugs to prevent or control vaginal inflammation, you can buy amoxicillin or metronidazole to take, choose the appropriate drug according to your age.