Rash at progesterone injection site

Ok ladies, I contacted my doctor but they always take a while to reply back and I’m overthinking. I woke up this morning with a large rash on my left buttock where we do progesterone shots. It’s all red, swollen super itchy bumps. Is this something to be worried about? I’ve also always had super sensitive skin that reacts easily so idk if it’s just a fluke? I know it comes down to what my doc says but I’m really just wondering if anyone else has had experience with this.