Low sales

[Alchemyandclay]

Hello. I was hacked and my acct hijacked on FB.  I've recently deleted my FB and unlinked my acct from my shopify.   I usually get daily sales, but rarely any traffic from FB, and haven't had any in several days.  Is there a way to check to be sure this person didn't hack into my website? I know this sounds ridiculous, but I've never had to deal with this before.  My bank has been notified. 

Thank you!