Hey there, I was getting my periods regularly like every month on exact date. In the month of March I exercised really hard so I get little bit early because I wanted to go on camp. And I got it 2-4 days before the actual date. And then the problem starts, In the month of April I didn't get it. I visited my family dr. she gave me their own medicines for 3 days 2 times, I asked about the problem she said I can't tell you about any problem we will see next month. So because of medicines I got it in the month of May, beginning of the week and again I didn't get it in this month.