How soon is too soon to test?

Elizabeth • 26. Married to my best friend. Have 2 amazing sons Nathan (9/8/13) and Oliver (5/27/16) and a little lady Annabel (5/9/18)
AF isn't due until the 7th when is the earliest I could test? I know after the supposed start date is best but I wanna know sooner, surely some of you understand. 

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