Concerns about HSG

I am going through fertility work up and I’ve done early cycle and day 21 labs, ultrasound and now I will be doing an HSG next to ensure my tubes are open. It hasn’t yet been scheduled. My concern is that they inject dye into your uterus. I have been trying to do research and find the ingredient list for this dye. I am severely allergic to the dye that they use in CT IV contrast, but I’m not sure which component of that that I’m allergic to. I know it’s not the iodine because I can eat shellfish with no problems.

My question is does anyone know what the components are of the HSG dye, or more specifically if it shares common ingredients with CT dye. I’m worried about having an allergic reaction and having it destroy my reproductive system. That probably sounds stupid and it’s probably my anxiety, but it’s a very real fear to me.