On weekly basis? I've been on norethindrone for many months for treatment of endometriosis (not for birth 'control' per se)... I began to gain weight a couple months ago as it is a side effect, and skipped a few pills here or there, then took just half at night only (dr. said I could try it)... and now I took full pill again last night. I feel cramps (you are not supposed to get period on this pill) coming yet it is just that pain; not the actual period. I think it is b/c I was sporadic with pill last 2 weeks...have you ever done this and what were your physical feelings or effects?