What Cases Vaginal Rash With Itching And Burning During Pregnancy?

Hi, I m 19, female and approximately 3 months pregnant with my second child. I have a rash that burns and itches constantly, and a higher estrogen level then most my age. There s a white discharge I have grown used to since my first menstral, but I feel that the rash keeps opening, and the discharge is burning it more. I use A&D treatment cream and wear pads that I change out every 4 hours.... What could be causing it? Could it be an std that is a silent and I m tossing it off as normal? Or should I be concerned? I never got rashes like this before.... I m worried. I live in an environment with stress and bed bugs could these be causes for increase as well in the discharge? What could it be and what can I do to help it at home?