Suggest Minimal Dose Of Duphaston To Postpone Periods

Hi Doctor, my age is 32 years 10 months. i am unmarried.i want to delay periods for only 2 days because of travelling. expected date is 1st july. doctor prescribed me to take Duphastom 10mg from 10 days before expected date. please help me by suggesting a minimal doze and date to start and stop medicine.below are the key notes from my health history. ---- i have hepatitis B from last few years. i am on homeopathic medication. according to my last medical reports, held in March 2014, my Liver and Kidney functions L.F.T & R.F.T were normal. ----Also, doctor told me (while i had viral infection last month) that i am having a mild asthma. however i am not taking any medication for it and having no problem in breathing after clearance of viral infection. ----i am having no swear stomach problem, but having loose motion for 2-3 days in a week. this started after having antibiotics last month for treatment of viral infection. now kindly tell me know if its safe (keeping in view of my medical history) to take Duphastom 10mg to delay periods till 2nd july 2014. or any other better medication to delay periods for 1-2 days from expected date. Thanks.