I started taking cerazette 7 days ago and have been struggling with breast pain, headaches and generally feeling low. I decided to stop taking it. How do I know how it will effect the timing of my next period? I stated taking it on day 5 of my period and usually would have ovulated yesterday. I am going on holiday when the first day of my next period was due (terrible timing) is it likely to be delayed by a week or will I still need to take period delay medication to avoid it?