Depressed while pregnant. Solution?

So I openly admit on here that every night I cry before going to sleep. I feel down , I've lost interest in all activities. I feel useless and worthless , incapable of doing anything right. I am lost for words which is very unlike me. I sit there for ages just on a trace feeling lost , unable to feel anything because I know my life situation won't change.

I'm going to be a single mum I'm 23 weeks pregnant ,my son will be a blessing to me. I just got out of a bad marriage ..still need to file for divorce. My husband is a narcissist, he belittled me.

I never want to find another man ever in my life again, I never want to marry. Give into big commitments , nothing. Love is a joke. Not even my parents treat me right....

What do I do ?

How do I overcome it ?