Had prceedure which involves radation and could be pregnant

Patient: I got an epidurial steriod back injection with mild sedation yesterday and i was susposed to have my period today. I am also prscribed 3 percocet pills a day for my fibromaligia 10 325. Since i missed my period what is the chance I harmed my potential fetus? Since the prceedure involves radation i so scared I could have harmed the fetus. I know being one day late doesnt mean im pregnant I just would like to know if I am, did I put the fetus in harm?