How is the safe period actually calculated

Patient's question:

Medical Description: The patient is a 17-year-old female with good physical health. There are no symptoms. Treatment history and effectiveness: There are no symptoms. Desired help: I want to know what date is the safe period if my girlfriend has her period on the 23rd.

Doctor's answer:

Medical Analysis: Hello, your period started on the 23rd. If that's the case, her next period might come around the 21st. Calculating this way, her safe period would be from July 28th to August 2nd and from August 13th to 20th.
Advice: If her menstrual cycle is not stable at 28-30 days, her safe period might not be accurately calculated. You can use ovulation test strips to check if she is ovulating. If there is no ovulation, it would be considered a safe period. It is best to use condoms to avoid pregnancy, as the safe period method is not very reliable and can still lead to pregnancy. Wishing you good health.
Reply to the person's reply: 2010-8-14 11:17:30 There are those within the safe period. If you didn't take any precautions...

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