Positive test??

Raquel • Married.Mom 👦🏻 10/15/14. 👧🏻 2/12/19. 👧🏻 12/21/20 trying for baby #4

So random question.... so when u get your positive test how are you supposed to know how far you are if most doctors won’t take you til 8 weeks?? With my son I was already 9 weeks when I found out so it was different. Plz comment