Can I legally give injections?

I was recently hired at a clinic as an uncertified medical assistant and was instructed by the physician (who is fully aware I am not certified) to begin giving simple IM injections today without any prior training or anything. Again, I am not certified as an MA, phlebotomist, or EMT. I did the injection under the guidance and direction of a certified MA, but I am not sure about the legality of this or if this is something I want to even bring up in interviews because of questionable ethics....

Can I legally give injections?

Can I legally give injections?