need help!!!

I am 15 years old and I lost my virginity 13 days ago. I didn't have any side effects afterwards (no pain, bleeding,etc.) until about 3 days ago. We used a condom and I was on birth control previously but I was off when we had sex. I am now bleeding and have vaginal pain that feels like stinging. I'm back on birth control but I don't know if that matters.  Can anyone help me find out what this is?? I want to have an idea and possibly wait it out before going to see the doctor about it. Thank you all!!!❤️