Deviry (medroxyprogesterone acetate) works by mimicking progesterone; your bleeding typically starts 3 to 10 days after you finish the course, not while taking it. Since you recently stopped taking it, your body likely just needs a few more days to respond and trigger the withdrawal bleed. Your negative pregnancy test is very reassuring. If your period does not arrive within 10 days of stopping the medication, please consult your healthcare provider to see if you need a longer course or further evaluation.
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Why is my period still late even though I had a negative pregnancy test and took Deviry for four days to help start it?