Suggest Remedy To Postpone Periods

hi ... i have lost my menstruation due date... last month it was 28 th of July 2014.. usually my periods are regular and prepones 2 days every month.. but this month i have lost it . and i wanna delay it now for atleast 7 days as i have a scheduled travel.. my age is 33years.. please suggest.. i am starting my travel on 2nd september 2014