cycles

so I’m 14, and I’ve had my period for 3 years now. But, ever since the start of this year I’ve only had 3 periods. On January 8-13, and I didn’t get my next period until 56 days later, March 5-11, and 88 days later, I just got my period yesterday. Is there reasons why I’ve barely gotten my period? I know I have to go to the doctor soon, because my grandmothers gynecologist said that wasn’t normal, even how young I am.