Concerned about my vagina

Emily

After the second time my SO and I had sex yesterday, my vagina was very sore and inflamed and it burns to pee now. We had sex again today, and I looked and I have like rug burn on my vaginal opening and a little bruising. It also has some blisters?? My partner and I took each other’s virginities and have been monogamous ever since. Could this all just be cause by lack of lubrication???