I Have Vaginal Burning During Sex My Partner Experiences A

I have vaginal burning during sex my partner experiences a small amount of pain as well. We have been with one another for 2 years faithfully. Recently we went on a vacation and had sexual intercourse many times, it started to burn after a couple times and it never had burned when we have had sex before. I thought I had a yeast infection turns out I don't I still feel a burning pain during sex. I don't feel it when I pee neither does my partner I also do not have a smell down there nor unusual discharge.... I'm very concerned about this I am on the depo provera shot please awnser I am very worried this was been occurring since our vacation during spring break.