Calculate menstrual cycle and ovulation date

Question
Hello doctor, I want to ask that, in October, I have a period on October 25 and October 29, I have no period and in November I have a period on November 15, but on November 18, I have no period, please let me know My cycle is 20 days and when will I ovulate? Please help me answer.
Nguyen Thi Minh Tam (1995)
Hello doctor, my menstrual cycle is on the 28th of every month and my period is clear on the 1st, so how many days is my menstrual cycle and when is ovulation? Looking forward to consulting your doctor. Thank you.
Vo Kim An (1989)
Answer
According to the information you provided, your menstrual cycle is 22 days and your ovulation may fall on the 6th to the 8th day. However, the calculation The exact date of ovulation should be monitored for at least 6 months, your menstrual status and other factors.