I had that, too - except lasting a "mere" 5 days. So unfair. Birth control pills can put you on the 4 week/5 days cycle- but not everyone wants to take them. I've also read you can take them in such a manner that you never have periods. Would speak to doctor about it. Anyhow, I am menopausal and have periods about twice a year now - and it is such a wonderful relief! Also, I had DS pretty easily when I was 42, and I've wondered if having 3 week cycles helped make that possible. Like ... do we have more eggs?