Yep, I agree. If you did what you did over an extended period of time then definitely you'd be at risk of liver damage, but as it is, your liver will not be harmed long term by what you've done. In fact, it has the capacity to fully recover from doing something like that in about a week if left to rest.
Most liver damage comes from abuse from either alcohol and/or medications over an extended period of time.
If you are still concerned however, you can ask your GP to give you a liver screening test (which is basically a blood test) and they can look at your blood levels and get an idea of the health on your liver from that.
Best wishes and don't abuse your liver in the future