when should i take a digital test?

I have a digital test, I know they’re supposed to be really accurate, but I’ve also heard you have to wait longer cause they need more HCG... basically, it was a pricey test and I don’t want to waste it! I’m two days late for AF, about 16 DPO. had unprotected sex 17 days ago. when should I test? (btw i just woke up and could potentially test today bc I still have FMU)

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