normal?

chrissy

i’ve been on the depo shot for a while now and i got my 2nd shot about a month or 2 ago and i haven’t been late on getting it at all. the first shot i missed my period one month then had it but since then i haven’t had my period at all but 2 days ago i started getting brown discharge and i’m wondering if it’s old blood or im about to start my actual period again or what. just wondering if it’s normal.