When To Expect Periods After Starting Regestrone?

hi i have two children, i m 26 yrs old i missed my peroids for 10days i consulted a gync she gave me regestrone 5mg for 5 days twice a day since my pregnancy test was negetive now wen can expect my peroids after completing the course for 5 days or during this 5 days i have started the course today only