so nervous tested so early

I am reading on so many apps that at 4 weeks is just now when you should be getting a positive on a pregnancy test. However I got mine literally at 9dpo. And it's so nerve racking to me because it was so early and of course I've tested every day since sill positive. It just has me scared since all these apps are saying you should just Now be getting +. Any advice? Should I be worried?