how csn i do this whithout gettinh jail time? important

Hi.... Thus is how it happened let say I fond I credit card today......I pucked it and put in on my pocket.....I'm in thre process or renovating my bathroom.  Ind I been in and out buying stuff for the project.... ( not with that credit card) the next day I bouhgt I few more thing I need it but here is the thing. I pass that wrong card... Did not notice it until today  ( two weeks later).  I'm always pay on the express line... So I didn't asked me for zip code or signature or anything like that... Other wise It will reject it and I would notice the mistake. How can I do to fix the problem without getting in trouble.?  Return the stuff or charge on my card? Or any other way.....I need help.   Please... I have family and don't want go compromise that for that thing.... Please please