I'm in high school and my periods have been fairly irregular since they started. There was even a large period of time without a period. This November, I had a normal period, though, and earlier this month, I had a heavier but normal period. I have visited the doctor and had an ultrasound done this summer when I had no periods, and everything was fine. Now, I'm having a second period in December. I don't know if it's something to be worried about because I've had such erratic periods, but I have been quite stressed lately as a musician always is during Christmastime. Thank you!