what is your period/ovulation "cycle"?

your cycle is from when to when?

if say someone starts their period on the 15th of every month and their period lasts 5 days is their cycle 26 days long (20th-next 15th) or is it 31 days long (15th to next 15th?)

I just got my period (only 4th time ever) about 3 weeks ago, but it ended 2 weeks ago (7 days long). buttttt, i just got my period again yesterday so 2 weeks later...would this particular cycle by 14 days or 21? thaks

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