What Causes Burning Sensation In Vagina?

my vagina is kind of burning, but not a sore burning just kind of discomfort, its only been happening since my gf fingered me last night. She was kind of rough, i wasnt very wet at the time and it hurt in a way. I'm also a virgin and she stretched me to 2 fingers and went deep. Im scared that i may have a yeast infection or have torn something