Hi Madam/ sir - I want to prepone my period as i have attend a water sports activity on 18th Feb.

My LMP was 8th Jan and menstrual cycle is usually 35 days. I have visited a gynaecologist and was advised to take regestrone 5mg, 3times for 3 days . I took this from 4-6 th Feb. and now waiting for periods to occur. However i am afraid that it should occur latest by 12th feb as it takes me 6 days easily . Please advise whether I should wait still for periods to occur or alternately begin with Regestrone 5mg twice a day to postpone the periods.