is suicidal thoughts normal while pregnant?

i know that might be a strange question. but i keep having horrible thoughts of suicide and self harm. i was already depressed before i became pregnant and use to self harm but I've been clean for two years. since I've gotten pregnant everything has gotten worse. im tired all the time(also a symptom of pregnancy) and i don't want to eat. and i am so insecure.

i feel so depressed i don't want to do anything or talk to anyone. all i think about is hurting myself and this feeling wont leave me. i am currently 21w along. i don't know what to do about the way im feeling and im just wondering if anyone has experienced this before and if it goes away after birth?