Ugh diaper rashes 😢

My baby is 6 months old and I’m pretty sure has her first diaper rash😭 her whole private area is red going to her butt. I’m so sad! She’s been using huggies for almost a month now and hasn’t irritated her and I change her frequently along with cleaning her very well. How can diaper rashes happened? Nothing out of the ordinary has changed for us so I’m curious on why she has it? Does it sound like a diaper rash?