I didn't get period for 1mo and half then i went to parenthood and the doc recommend to use nuva ring again to get period. i did and my period back.

What's your question: Check out http://www.Nuvaring.Com/consumer/faqs/index.Asp for frequently asked questions re nuvaring. Btw, when used as directed, any hormonal birth control pill can be used to regulate one's menses. In fact, when placebo/sugar pills are skipped & next month's pack is started, one can also purposefully delay menses, which may be useful for vacations & honeymoons.