is it bad to dump a lot on my therapist on our last session?

this is a repost from another subreddit as i desperately need answers

hello! 15f here in the UK. i am currently under teir 3 camhs and im about to end my therapy sessions with someone ive had since february. long story short, i have a lot i want to talk about which is probably a safeguarding issue relating to my health. i want to talk about a suicide attempt i had that nobody knows about and how just insanely depressed ive been for months and not told anyone. everyone's thinking ive gotten better but i really havent and it's gotten to the point where if i don't tell anyone i may lose my life. im hanging on, only by a thread but im safe and im not planning anything as of now. i just really need to talk to someone. is it bad to bring all of this to my last therapy session?