WARNING this post gets graphic, but I think it might be important.

I posted this question on yahoo and only got one kinda rude answer, but I'm kinda freaked out!

Yesterday I was really bored so I (gasp) decided to masturbate. When I got to my climax or orgasm point or whatever I felt a horrible pain in my pelvis area which has never happened before.
This morning when I went to the bathroom there was a pink discharge in my underwear, I know it wasn't blood because I "popped my cherry" a couple years ago on accident. Also, it's only been a week and a half since my last period so that's definitely not it. Lastly, I'm a virgin so I can't be pregnant.
I'm not bleeding anymore, but I think something might be wrong inside of me.

Does anyone have any ideas as to what happened or any precautions I should take? Should I go to the doctor?

I don't have anyone to tell these things, so I'm a little worried, because no one can help me.
Thank you!