Stop! Don't flush. You still have 5 weeks or more left in flower. I'm assuming in the other answers, they thought you meant week 8 of flower. You still have lots of time left. Wait until at least 60% of your hairs have turned red AND curled back into the flower.
Just a sidenote: flushing is altogether pointless and harmful. The science is not on the side of flushing, but if you must flush, wait at least 3-4 more weeks.
Cheers!