Sounds as if you are irregular. That is, some women menstruate 11 or 13 times per year. It may be weight gain, emotional stress, hormone problems, pelvic organ problems, an eating disorder, increase in exercise or other diseases. Suggestion is to RELAX. The body has to get in balance and becoming agitated will not help the concern. Watch the volume of food you eat and focus on being a conscious healthy woman by staying moderately active. Feel good about life and the fact you are in control of your life.