Sore chest from T?

I had my first T shot 4 days ago, and the last 2 days, my chest has been super sore. Like right around my nipple area. Wondering if this could be related to starting T? I've had top surgery, so I don't expect that I have much breast tissue left...I also started a sleep medication a few days before my T shot, and muscle/body aches can be a side effect, so it could also just be from that. Wondering if anyone has had this effect from starting T? Thanks :)