Am I actually considered a regular?

I've read that to actually be considered "irregular" your periods have to be more than like 14 days off each month. But I have considered myself irregular since being off BC... Before BC I would start on the same day every month... Now, even though the cycles don't seem very off, they can be. And about once a year I'll have two in one month or totally skip one. I just don't get how going from a 21day cycle to a 38 day cycle can be regular lol.