It’s okay to take days off.
It’s okay not to be productive every day.
Having less productive days doesn’t mean you’re failing or that you won’t succeed.
Learn to embrace unproductive days as a necessary part of the PhD journey. We all have ups and downs and we must learn to both recognise them and work around them. Don’t try to fight yourself when you’re unmotivated; be kind and self-soothing instead. The world will keep on spinning if you stop writing for a day.
Good luck and have a great weekend.