I would please like to know your experiences TIA

ladies with rh- or negative blood at how many weeks did yall get the rhogam shot? is there anybody that didnt get it at all and was still okay? i just turned 28 weeks and there taking a while for the shot to get approved so i havent gotten it and im freaking out. and scared. but the doctors seem okay for me taking it somr weeks later. i would still like a peace of mind if any1 has taken it later ?