Allergic to pregnancy

So this is my 5th pregnancy, and about week 6 I started breaking out in hives. Super itchy all over my body. Ended up at the dr and eventually the ER bc they spread to my throat. The ER ran lots of tests and everything was fine lab work wise. She said based off her research, I’m probably allergic to the increase in progesterone. Lucky me. My ob prescribed a steroid and it worked so well until they ran out. Has anyone else ran into this problem? I am miserable and praying this doesn’t last my entire pregnancy.