Micronor (norethindrone): Ortho micronor (norethindrone) (http://www.Drugs.Com/cdi/ortho-micronor.Html) is a progestin-only birth control pill that requires much stricter attention to timing of dose, such as you describe. Under those conditions, it is a very effective form of contraception by preventing ovulation. Some women still get normal periods while on pill but that doesn't imply they're ovulating.
Answered 10/27/2016
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