Prego Test

I’m on the depo shot and i get them on time so I’m pretty sure I’m good. Anyway, about a month ago I took 2 pregnancy tests and both came up negative. However, I took the first one around 1 and it came back negative and the next morning, around 8 I took the other and it came back negative. Should I have waited a few more days to take the other test or am I not pregnant?

(For future references)