Okay, here is an article with the title "When is ovulation on menstrual period on the 11th?":

For many women, it's important to know how to calculate when you're ovulating. If you are a woman who has your period on the 11th, when is your ovulation date?

According to the American calendar, a woman's menstrual cycle usually lasts 28 days, and their ovulation period usually occurs about 14 days before their next period. Therefore, if your menstrual cycle is 28 days, then ovulation is 14 days before your next period.

However, it should be noted that a woman’s menstrual cycle will be affected by many factors, such as diet, exercise, stress, etc. Therefore, it may take some time to accurately calculate your ovulation period.

If you want to accurately calculate your ovulation period, you can consider using some professional calculation methods, such as body temperature measurement, calendar calculation, etc. Also, seek help from your doctor, who may be able to use some lab tests to help you determine when you are ovulating.

Overall, knowing your ovulation period is important for maintaining good health and promoting a romantic relationship. By accurately calculating your ovulation period, you can better understand your body's needs and better meet your own and your partner's needs.