??? Hives??? Rash???

So hi... I’m lying on the couch watching TV, wearing jeans... and then all of a sudden i just get so itchy! My legs started to burn. Something told me to take my pants off... lo & behold i have bumps forming all over me! Has anyone ever had this happen?! I’m somewhere in between 32 &34 weeks(I’m convinced my new physician is a liar so please bare with me). They’ve gone down a lot, still feel like I’m on fire though. Not allergic to anything and never had hives but with pregnancy i assume anything is possible