Hello, I Have A Concern On Weither Or Not I

Hello, I have a concern on weither or not I have an std. I had my tampon in and was not aware if i took it out before I had sex and I was not properly lubricated. A condom was used and he pulled out. I woke up the next morning with pain around my vagina and a little bit of blood and the next day I got brown discharge and it did smell.