Help!!

So I got the depo shot on December 27th and today is February 12th, I still haven’t gotten my period however I had a little spotting the second week I got the shot. Now I’m experiencing some brown discharge and I’m terrified that it’s a pregnancy. Is it normal to spot brown discharge instead of your period on the shot?

I’ve been waiting a few days to see if my period will come but this discharge just comes and goes for the last 4 days. I haven’t taken a pregnancy test yet. I just want to know if this is normal?