Don't worry Andrew, it could be the dosage, it could be your body is more slow with changes...
I didn't had any change until the second month or third. And they were not very noticeable (My voice didn't crack until 4-5 months...). I was given a type of shots that were almost destroying me (massive emotional peaks, usually the worst, didn't stop bleeding, body was tired entire time...) then I did my own research and asked my endo for other kind of shot (different brand + more dosage). The two shots worked different, the first one, taken once a month, was "we put T on your body, when it runs out, you just get pissed out". The second one (which I've been taken for almost 2 years now) is "this is gonna liberate your OWN T on your body" So it doesn't run out, and it isn't so aggressive, since is my own body who makes the T. I take this once every three months, the changes were slow, but I feel better emotionaly and physically.
So if I were you I would wait some time, if you feel right and you start experiencing changes I would say stick to it. If you feel uncomfortable and something just feels wrong (red death, pain, being tired all the time, etc) I would suggest talking to your endo for a change of shots/brand/dosage maybe?
Good luck man!