Meprate 10 mg. Take to prepone periods?

Hi all, My wife had an periods on 20 jan and she was expecting next period near by 20th feb as dates was missed we visited gynec and she asked to do reports all were negative. And after that she prescribed meprate 10 mg to get periods soon but after 5 days of dose periods didnt start. we waited for 3-4 days and periods started on 9th feb. Lmp was 20 th jan. Now we again visited doctor as we have religious pooja from 7th till 15th march amd we want either prepone before 7th march or postpone after 15th so doctor again suggested meprate to take from 7th march till 14th march. I do not understand in starting meprate was used to get periods soon. Now on 7th march she told with meprate periods will be delayed. Howz that possible same tablet act as prepone and postponed. I doubted. Please assist with better advise. Also  ncnorm p and ncncorm e are two tablets which was prescribed to prepone vy other doctor a year ago but can this be take to prepone periods?