Pregnant on depo? Please help!

I had unprotected sex with in the same month i got my depo shot before i got the shot. He pulled out but ik that’s not effective. ( i don’t particularly need to get pregnant but I’m okay if i am) so i got my depo shot and now my period is four days late and it’s always regular my period is only four days long so that’s basically my whole period. I got all of my period symptoms even the tugging cramping of my uterus but it has yet to arrive. I’m just wondering if anyone’s period was super late on the depo shot or they didn’t get a period for some reason. USUALLY you bleed a whole lot on depo so I’m just super bewildered. I kinda hope I’m pregnant lol i took a pregnancy test it was negative but i think i should have waited a week after my missed period for accurate results

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