Depo, my horror for now

Rosie

went to the Dr. for a depo shot!

when I went there was a possibility that I was pregnant, (all test came back negative!)

I went to the Dr the day I was supposed to start (I got the shot) I never started and the lady told me I would if I was far enough along in my cycle, so now I'm worried I might actually be pregnant and I'm too scared to take another test!

should I or should I trust the shot and just forget about it!?!