Hi I Wanted To Delay My Periods Next Month For

Hi I wanted to delay my periods next month for 7 days, so started taking femilon after my last periods ended. I planned to continue till the day I wanted to have my periods . I have taken the pills for only 5 days and am feeling extreme nausea and puckish all the time. I have taken femilon earlier on doctors prescription last year when my periods were irregular with extremely heavy flow. But never had this kind of nausea. Plz let me whether I should change my med or continue till this feeling ceases.