What is it in music when a rhythmic pattern goes over the bar?

I was tapping my toe in 6/8 and tapping a pattern with my hand but realized they fall out of sync. And I think it takes 12 cycles for the whole thing to repeat. The pattern simply goes an extra 8th or quarter note. Is this just considered a 6 vs 72 polyrhythm? Or is there a better way to describe it. The hand pattern also has some variation not just evenly spaced notes. It just lasts 6.5 beats instead of 6.