Am I pregnant, or Am I crazy? HELP?

Okay so this has never happened before, I had unprotected sex about three weeks ago, and when I did, I was ovulating, because I was going to, "well should of" started my period about 2 days after having sex. Now I'm about 2 weeks late on my period. So, About a week and a half later after having sex, I had some brown-and pinkish discharge that lasted for 2 days about. And I've had tiny spotting of blood before the discharge came. Now, I noticed yesterday, I'm getting this thick slimy white discharge, with brown in it also? WHATS GOING ON WITH ME??? I really need help. Btw, im 16. I was cramping, but after the brown and pink discharge went away, The cramping stopped. But now its back. And also When I would get brown discharge like it, it would end up turning into my period, but this time, it just went away. Im so confused, I need advice. btw, I took a pregnancy test, and It was a clear-blue test, and i had one dark blue line, and one faint, noticeable blue line.. help.