Pregnancy

Hi..I have one question.my last period start on 1/1/2021..every month have period without delay.normaly 4 days.no any issue on health.4/2 /2021..I check upt and get positive..also check at kk on 5/2/2021 get positive result..but on 6/2/2021 morning get period as normal.i went to scan ,and doc said now can't c anything..and just give duphaston..and said come back on 20/2/2021 for scan again.my period last for 2 days only..and no more.i get period 6 and 7 only.. yesterday no more .untill today.can advised me..izit I'm pregnant..feel worry abt it.kindly advised