pls help i need opinions..

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okay you guys i missed my period last month ( which in my 5 years of having a period (( started when i was 12, i’m 17)) i never have) , and home pregnancy tests & a blood test came bck negative when i was 5 days late . soo i got on the birth control shot that same day everything was negative .. i’m 11 days late now . still nooo period . i’m just not sure what to think ? i still believe i could be pregnant but maybe i’m paranoid from missing that period.

PSA:MY PERIOD WAS LATE BEFORE I GOT ON THE SHOT.