Since you recently switched from Femilion (desogestrel/ethinyl estradiol) to Deviry (medroxyprogesterone acetate), your body is likely adjusting to these hormonal changes. Sometimes, after stopping Deviry, a withdrawal bleed can take longer than the usual 3 to 10 days, especially if your estrogen levels are currently low or if your uterine lining is thin from the previous medication. Other factors like stress or a potential pregnancy can also cause a delay. Please take a home pregnancy test if you are sexually active, and I highly recommend consulting your gynecologist to safely evaluate your hormone levels and plan the next steps.