Help!!

GF
I don't start my period for another 6 days, I have no symptoms really that are jumping out to me to make me be pregnant, but I went ahead and tested today with a rinky dinky $1 test and it was negative.. Was it too early to test? Or is it because it was cheap?? Idk what to do.. Here was my calender for July.. And I start my period aug 9th..