Ovulation is the starting action and the period is the
ending action, not the
other way around. A woman
ovulates, and about 14 or 15 days later, her period comes to clean out the unneeded lining (if she didn't get pregnant in the meantime).
Then the body goes on its merry way, and when it feels ready and healthy and not stressed, it ovulates, and then 14 or 15 days later, if the woman hasn't gotten pregnant in the meantime, her period comes.