You could be rejected for 101 different reasons. The thing is, it’s March now. Back in January, when you realized your mistake it might have been possible to fix it. Now, it is what it is.
And what it is is that you are in the final countdown days and agonizing over every detail. The rough draft is awful in your opinion- but the AO might even like it better (obviously, that depends on what you polished between the rough and the final).
Do yourself a kindness: find ways to stay really busy between now & decision day. Work hard on doing things that make you happy, that do something for somebody else, that use up the space in your brain that is currently fretting over things you cannot change or control!
Good luck- & come back & tell us how it works out!