I ran across this online and thought it might answer a lot of questions that tend to pop up here.

I have to say, however, that I have had nearly all these issues at one time or another (including having periods 13-14 days apart, instead of 30 or whatever) and I have yet to find a doctor who gave a crap about it. I hope that's more exception than rule.

(HealthDay News) - A regular, healthy menstrual cycle is a good indicator of a woman's reproductive health. If you have problems with your period, see your doctor.

Here's a list of warning signs that something may be wrong, provided by the U.S. Department of Health and Human Services:

* If you have no menstrual cycle by age 15, or within three years of breast development.
* If you have no period for more than 90 days.
* If you suddenly have irregular periods after having had regular periods consistently.
* If you have periods very often (21 days or less since the prior one) or very infrequently (45 days or more since the prior one).
* If you have periods that last longer than seven days.
* If you have abnormally heavy bleeding, or bleed or spot between periods.
* If you have severe pain, sickness or fever during your period or after using tampons.