Caffeine intake may be the cause of a missedmenstrual period. Consumption of coffee disrupts corps luteum function. It will be much better if women give up taking alot of coffee. It can be gradually cut down little by little.
High stress can cause a missed menstrual period, and many people consume more caffeine when trying to meet production deadlines. Caffeine in itself will not.
An excess of caffeine can effect your normal menstrual period, but there could also be a lot of other conditions. Try to drink less coffee, or consult a doctor.