When is the soonest you got your positive?

I have a box of frer and some wondfo for testing. When’s the soonest you’ve received a positive.

Editing to add: the app had my period start date at June 17th and an estimated ovulation date for June 3. Well I got a very clear positive opk on May 29th, added that to the glow app and the app changed my estimated period date from June 17th to June 13th. So while I know we can test starting 8dpo the frer says “up to 6 days before your missed period” and I don’t even know when to expect my period now! 🤔