Postpartum hives?

I’ll be calling my doctor tomorrow, but I’ve recently broken out a rash almost everywhere on my body. I had a c section Wednesday. About a week and half before though I had a rash on my stomach where my stretch marks developed. Now I still have that rash on my stomach only now my stretch marks look inflamed and have bumps running a long the lines. It’s so itchy. Now, after I had my baby I started with a rash on my left upper arm above my armpit just 2 days ago. I have it now on my right upper arm going to my shoulder blade. I have it on my thigh. I have it under my butt line and on my butt. And I have it a little bit on my back. If I scratch they start to spread more. Could this be postpartum hives? Or a side effect from all the medication I took at the hospital?