Hi Dr , M 28 Yr . I Missed My

Hi dr , m 28 yr . I missed my period in nov 28 th . Last period was in 31 oct . I had my Sonography n HCG test after 15 days of aspected date of period that is 28 ... tests was negative ... Dr has prescribed me meprate for 5 days twice a day .. yesterday last day of dat course bt still I didnt got my periods ...plzz suggest me wat should I do .....shuld I continue it again for 5 days or any other drug if any plzz prescribe me ...thank u .