Are you afraid of having to push yourself to the office this weekend, or starting Monday on a bad foot? Just like you don't start writing a brand new piece of software an hour before leaving for vacation - you don't push to production on Fridays.
Also, Fridays are often used for huddles. So, pushing on a day like Wednesday is way smarter since you can have critical issues squashed by the time it comes to the retrospective, which requires signs of improvement obtained from the past iteration to validate the value of your team.