Calculate the day of ovulation according to the menstrual cycle

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Question
Doctor let me ask if I have my period on the 28th of every month, if it takes 7 days to clean, the doctor can tell me what day I ovulate?
Nguyen Thi Lan (1992)
Hello doctor, from the 1st to the 6th menstrual period is clean, what is the day of ovulation, please answer for me. Thank you doctor.
Ly Thi Luu (2000)
Hello doctor, I want to ask a few questions. I want to track ovulation to get pregnant as desired. Every month I have on the 15th day of the lunar calendar, but because I take oral contraceptives every day, I still have a 2-3 day deviation, but last month I lost 1 week on the 21st day of the lunar calendar. I hope the doctor can help me so I have to calculate the day of ovulation.
Do Thu Hien (1991)
Answer
You need to track your menstrual cycle for at least 8 consecutive months. The most suitable time to conceive is calculated as follows:
With the shortest cycle : Subtract 18 days. For example your cycle is 25 days. (25-18=7). Therefore, the most fertile day is the 7th day after the first day of the menstrual cycle. With the longest cycle: Same as above but subtract 11 days. For example, the cycle is 30 days. (30-11=19). With this ovulation calculator, your fertile period is from day 7 to day 19 of your menstrual cycle.
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