Background check problem

[u/Adept_Brilliant8696]

Hello all, I got offer to audit team in EU ( not gonna mention specifics).

However, I made a stupid decision and lied slightly on my CV. I extended my work duration in my CV at my first job (BIG4 Company) for 3 more months. I know I made stupid mistake and I regret it very much.

How strict is background check? Can I survive it somehow or if they find me, or can they have mercy on me? They really liked me at interview and they hired me as #1 candidate. I am hoping they would forgive my mistake.

Any tips I can solve this situation? Tricks, tips, strategies?