Alcohol is just fermented fruit sugar and as such will jeopardize your state of ketosis. But as others have said, the only thing you can do is to move on and start fresh.. many of us make mistakes and its what you do following that mistake that is the deciding factor.
You are here askign for advice, so you must want this....
Try and work out why you went down the route you did, so that you can choose an alternative action next time!
Good luck with getting your head straight and getting back ont he plan
xx