When should I test? I want to do an early test cause I can't wait but all my apps say my af is due on diff days

Britney • I'm a happily married to the love of my life and I'm a 27 year old who is graduating university soon this year and is hoping to start having some beautiful babies soon! We have had one pregnancy and miscarriage at 7 weeks so far hoping for a rainbow baby
Lol one says the 15 16 and the other says the 19th I was thinking of starting tommorrow? I'm only like 7-8dpo though what do u guys think?