Could I be pregnant? I'm 20 years old, I've never been pregnant. I don't take any kind of birth control. I have been having strange spotting for a little over a month now. My period was due last week but I never actually bled like I do with my normal period. Then I began to notice white tissue looking stuff in the toilet after I pee. I had a uti 2 weeks ago but antibiotics cleared that up. I also took a prego test 2 weeks ago and got a negative. Someone give me some kind of advise or thoughts?! Please. 