You should, don't want to get any ph issues while flushing, it can turn some good bud into bad looking bud, but it can also turn some good looking bud into some badass bud.
Stay lit growmie.
No don't pH when you flush 👌 read about ice water flush 👍 you're close...idk the strain you're growing but your buds are juicy 👍👌 I'd start the flush in a week but check your trichomes day to day 👍👌👊🤘