I have not had a period in three months, should I be concerned? I am recently engaged so I just started having sex. We are use protection and taken multiple pregnancy tests and I am not pregnant. I have recently quit playing college basketball so i am not working out every day, I got a new job, and I am taking rigorous classes. I have read that stress and fluctuation of weight would cause amenorrhea but should i be worried that it has been 3 months?