Hello Thanks for writing to us with your health concern. First of all, repeat a pregnancy test, sometimes there might be delayed conception. Also there could be a chemical pregnancy, or an ectopic pregnancy, which might not show up on a pregnancy test. Next, there are various other reasons for a missed period - stress, anxiety, emotional turbulence, weight loss or gain that is rapid and massive, ingestion of medications that affect your hormonal axis, travelling, late nights, erratic eating habits, smoking, drinking etc. These mild hormonal imbalances respond to progesterone withdrawal ( Deviry ). First complete the course for 5 days, and then wait for a week. You would bleed by then. If you do not have a period within a week after stopping drugs ( totally 12 days, 5 days of medication plus one week of waiting ), then consult a gynecologist Have a thorough internal evaluation - per vaginum and per speculum. Also, hormonal tests - FSH, LH, TSH, Prolactin, OGTT, DHEAS, Free testosterone, Lipid profile. And a pelvic ultrasound scan done transvaginally. This will rule out conditions such as hypothyroidism, Polycystic Ovarian syndrome , endometrial hyperplasia etc. Alternatively, before taking the drug, see your doctor straightaway on Friday. All the best. Please feel free to discuss further.