I have my period every 39 days, and it lasts for 5-6 days, which is particularly heavy. What could be the reason?

Patient's question:

Symptom Description: When I have heavy menstruation, I can't breathe properly, I have stomach pain, and I feel dizzy.
History of Treatment and Effect: Around October 19, 2009, I was hospitalized for treatment for 3 days and got better. On August 10, 2010, I went to the hospital again with the same symptoms and received injections. The bleeding was neither too much nor too little.
What Help I Want: I want to know what the cause is, and how I can feel better if I have these symptoms again. What medicine is effective, and what has fewer side effects.

Doctor's answer:

Hello! Is it 5 days after your period ends? How many days is your menstrual cycle? You need to know how many days your menstrual cycle is to determine if you can get pregnant. If you have sex between the 10th and 16th day before your next period, it is easier to get pregnant. The day of ovulation is 14 days before your period.
A menstrual cycle refers to the time from the first day of this period to the first day of the next period. A normal menstrual cycle is 21-35 days, and most people have a cycle of about 28 days. However, the situation you mentioned—where your menstrual cycle is 5 to 6 days—definitely sounds incorrect. It should be the duration of vaginal bleeding during each period, right? In that case, it would be a 5-6-day period, not a menstrual cycle.
The fertile window refers to the period from the 10th to the 19th day before your next period. If your menstrual cycle is about 28 days, the 5th day of your cycle would be in the safe period, and having sex should not lead to pregnancy.

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