I inserted the needle into my son’s leg and when I pushed the plunger down all this liquid came up and pooled on his leg. I removed the needed and reinserted to complete the injection. Quite a bit of liquid was pooled on top of his leg and I would say he only got about 1/2 of the dose. I’m upset and was wondering what we should do. I’ve left messages for his doc so waiting. Has this happened to anyone else?