Is it useful to take birth control pills to delay menstruation when traveling?

It is indeed very effective to take birth control pills to delay menstruation, but it is recommended not to use them because it is too harmful to the body and will lead to unstable menstrual periods, endocrine disorders, abnormal menstrual blood, etc. Gynecological problems can even lead to fallopian tube blockage in serious cases, which is infertility.

You don’t necessarily have to postpone your menstrual period. You just don’t go swimming in the sea when you go there. Why do you want to change your menstrual period?