What am I looking at for class b misdemeaner recklessness

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Hi I live in PA. at a small party I had an accidental discharge of my carry handgun. It struck a girl in the leg. Luckily she was out of the hospital the same night. Next morning I got a call from police, took my handgun for evidence and gave him my story what happened. I have a carry permit and clean record ( used ARD once to expunge previous misdemeanor ) Fast forward a few days I got a call from cop saying most likely there will be class b misdemeanor charge for recklessness even tho it was a accident. I know I will have to hire a lawyer, what can i expect?