First period started 15 days ago .. and is still bleeding .?

Well ,, my period started on Wednesday June 15th 2011 ; and has been going for 15 days .. & still hasn't stopped . This is a little gross ,, but the period blood just recently started smelling almost like ammonia (cat pee) . I also have quiet a few clots when I go to the bathroom .. my urine is also bloody ,, like I pee urine & blood (eww I know) . I feel like this isn't normal ,, the flow isn't really heavey .. its light & sometimes medium . And what's weird is I don't have any pain .. itching .. noo symptoms that you get for a period or infection . I'm worried & it is really awkward for me to tell my mom about it .. and I know I should ,, but maybe someone can give a little information first . (I'm 14 btw) . And I'm a virgin .. true love waits <3 I don't take any medications or birth control either .