Sorry to hear about your troubles.
Yesterday's backups (or Monday's) are looking really good right now. You just started, have you met the IT guy yet? Sounds like you're about to...
FMP does not have a rollback feature native, but your system may have something like it...it depends on who decided to implement what.
If they let you start on Monday, then import many files into a live database with no backups...shame on them.
Making mistakes is part of everyone's learning process.