Hi I Took Gynera Right After My Period, During The

Hi i took gynera right after my period, during the first 7days of taking the pills i had very bad side effects so i discontinue using it my worries, do i get to be pregnant having sex unprotected onthe 20th day although considered that my ovulation period passed already, am not 7 days delayed, and since the day i stop using the pill, till date am experiencing extreme head ache, please explain the possibility