I use birth control (Yaz), and a few days ago I started feeling slight pains after using the bathroom, one of my friends told me that it might be a Urinary Tract Infection. So she gave me some pills that she had to help it, but it didn't. And today when i went to the bathroom there was dark thick discharge (it couldn't have been blood). I had my period about 2 weeks ago, & I'm not going to start for about another 2 weeks, so I'm not sure what this is. Am I pregnant?