Swollen urethra and opening of my vagina is swollen, hurts to go to the restroom because of burning sensatation. Uti? Happened after sex. Std?

Get checked. It's likely that you have a uriary tract infection - not uncommon after intercourse. Get checked for this and for stds. It may help to urinate after having sex to flush out bacteria. And it's always a good idea to use condoms to protect yourselves from stds. Your doctor or planned parenthood can help. Good luck.Lgromkomd.