Hello Doctor I Am A Female 28 Not Married ...but

hello doctor i am a female 28 not married ...but i am sexsually involved am having irregular periods since 2 month ... recently i missed my period for 2 months..but i am not pregnent i will check throught pregnancy kit so 10 days before my doctor advised me to take deviry 10mg tablet (2 tablets daily for 5 days) .. but after taking deviry i have not get my period so plz suggest