Has anyone else had this problem?

I’m due in August. I also have a two year old. This is my 6th pregnancy. While I was pregnant with my previous child I got a rash on my hip. It itched like crazy, I tried every lotion, hydro cortisone cream, Benadryl etc, it would stop the itching til it dried then the itch would be worse. It finally got bad enough that I showed and told my nurse practitioner. She looked at me like I was crazy and then decided to test me for everything under the sun: shingles, hepatitis, herpes, measles everything you can think of. All negative, no surprise there. And she never prescribed me anything for it. She suggested callomine lotion (like chicken pox). Also didn’t help. I got the rash at about 7 months pregnant and dealt with it there after and literally after giving birth the rash went away. I at one point thought maybe it was a rash cause I sleep on my right side and maybe it’s from that. Idk no idea. So now I’m 20 weeks pregnant, the rash has appeared again, same exact spot. No creams or lotions are working. Has the happened to anyone else? Did anything work for you? It’s already spreading and bad this time and I’m not sure I can endure it for 4 more months. Also this time I’ve only been sleeping on my left side because my 2 yo has been co sleeping with me and I sleep on my side opposite her, so I now know it’s not from side sleeping. What is this?