Comment please

So i got tested for all type of sexual transmitted diseases! & everything came out negative so im fine but just last week inoticed i have a rash or idk its itchy & burns really bad on my private on the lips & on the clit area too....it burns more especially when i tput soap on it. I bought this lotion that helps reduce itch & burning & has helped but im just scared it could b something els..! Im 19 weeks could it be that my hormones are. Unbalanced or something ? Idk i see my midwife till Thurs for the antimony scan & im trying to wait till then but the whole thing doe have me scaredd that it could be something worse .