Silly Question.. Please forgive me.. 😑

So AF is due between the 27th & 30th of July, I couldn't contain myself and did a HPT yesterday (25th July).. Resulted in a BFN.. Would a Positive result show already or am I being an over eager beaver!? How early would a test show positive? And does this vary from lady to lady? Hoping this all made some sense at least.. and I do apologize in advance if this question has been posted a million times before.. 😇 Baby Dust to All you Gorgeous Ladies!!💐