I am an almost 18 year old female and I am sexualy active and don't want my parents to know. I had protected intercorse yesterday and today I have had some vaginal pain. I found that I urinated blood but I had no pain when I did and I have had no urgency or problems urinating. It wasn't the first time I urinated today but it was the first time there was blood. I do not know what is going on but any advise would be helpful.