Hello, Thanks for sharing your health concern with us. I have gone through your query. In the current scenario, the best way out is to exclude/confirm a pregnancy through the HPT or the blood test before using the hormone medication. Also, if you wish to put off your impending period, you may have to take two or three doses depending on your body weight for such time util you need, but not more than two weeks. If you use it for only one day, you may see withdrawal bleeding 3-7 days later. Hope this helps.