I NEED HELP! PLEASEE! PLEASE!?

I'm having serious thoughts about suicide & I feel like I might actually do it. I was recently diagnosed as clinically depressed. I'm 13 & a girl. I was recently put on Celexa. Although, I know that won't affect me for maybe a few weeks.. but anyway, I am having extreme suicidal thoughts, meaning how & when and blah.. my next appointment is in 2 weeks with my therapist person.. should I talk to my parents? My parents now know about everything.. like my suicidal thoughts. They also that I have been cutting myself. So I am willing to talk to them.. but if you think I need to.. how would I tell them? & what do you think they would do..?