How do you stop your menstrual period from coming on time?

Never try to stop your cycle by yourself, it will either not work or hurt you. The amount of time between periods fluctuates based on stress and hormones, especially if you only started menstruating recently. "On time" may not be an accurate estimate of when you will start.

There are some Birth Control pills which can cause fewer periods. If you are interested in having fewer periods every year, talk to your gynecologist about whether one of them will work for you.