IANAD, but here's two pieces of information that might put your mind at ease.
1) The fact that T is suspended in oil means it's a depot injection, which means that it stays where you inject it, and it will be absorbed over a long period of time. Bleeding after a shot is very common, so obviously that's not all it takes for the T to come out. It tends to stay in the depot that the shot makes.
2) I've heard of T leaking out from a shot (when someone does something like nick a blood vessel, or something else that would cause a spray or gush of blood), but from what I've heard, you would see the oil come out before the blood, and it would not be "stained with blood." It would look just like it does before you inject it.