Depressed and pregnant 😔

I’m in my third trimester & I’ve been so depressed the past couple days , I have two other children one is 2 and my second is 1 , and i would think having them would keep me busy but it’s not I’m so depressed , I just wanna be locked away and left alone , I feel like I can’t do this anymore 😔 has any other ladies dealt with this ? Please I need some advice !!