hi,my age is 26.9 and height is 5.7'' and weight is 67 .Have been married from last 9 months.was trying to conceive doctor put me on medication (duphaston)for 10 days ,twice a day. but after 10 days when i took my last medicine .i had my periods.but my doctor said it will be after 4 days.but periods were right after the last dose my be after 12 hours. I had very bad periods pain.as it was less in flow.took volt fast twice a day just to control the pain but after my periods over now i have gas problem.and it happened first time in my life.usually after my periods i have no problems.kindly tell what went wrong and had thsi problem