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This has nothing to do with menarche.
Before menstruation, emotional instability and increased vaginal discharge are generally the first menarche at the age of 12-14.
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It's okay, there will be some irregularities in the early stages of menstruation, and it will get better slowly as you get older.
This should be your personal psychological effect, and it has nothing to do with menarche.
There should be vaginal discharge before menarche, vaginal bleeding may be due to menstruation, or it may be other problems.
In this case, it is considered to be menstrual cramps, continue to observe, if there are no other uncomfortable symptoms, there is no need to go to the hospital, pay attention to hygiene during menstruation, do not get cold, pay attention to regulate pressure, and try not to eat spicy, irritating and too cold food.
How is the development of the secondary sex.
Your symptoms: consider that you have vaginitis or vaginal infection, as far as I have not analyzed, there is a bad smell on your lower body or underwear. As for menstruation, it is not yet the time of menarche. Suggestion: Communicate with your family and go to the hospital to check the secretions and blood routine tests. I hope to be able to adopt and like it.