My doctor prescribed gynaecosid to induce my periods. This is now the fourth day and my periods have not yet come. I know I am required to wait until 6 days elapse, but I wanted to find out what are the implications should they not come? I have pcos and in my last cycle, I had taken a combination of letrozole and gonal f but follicles did not mature properly. I now want to start the second cyle.