Wondering if this is or has happened to anyone else

Tiana • 5/17💙

About a month ago My vagina started itching really bad..I thought I had a yeast infection and called my Obgyn and set up an appointment and got a swab and everything came back negative..so I tried to ignore it but still the itching..when I have sex it’s ten times worse and gets very swollen, sore, and itchy..I got swabbed again and nothing came back also nothing in blood test..I’m so confused why this is happening and wondering if this has happened to anyone else? And if so what was it? 25 weeks pregnant