Pregnancy and depression

I've suffered from depression for a very long time. I grew up with an addict mother and an abusive step mother. I also dealt with a lot of bullying all through school. 2 years ago in June I witnessed the death of a girl my age. A few weeks later I heard a man screaming for help after a gun went off and saw the get away car speed off. It was a man in a house near me that was shot. That same night I get a call in the middle of the night that my mother tried to commit suicide and was found not breathing. All in the same summer I left my abusive ex husband.

Now, I did some counseling and tried some meds. I've not had it hit me at all since November. I'm newly pregnant now and I'm so happy about it but this awful sad feeling is hard to shake. I just want to sit in a hot shower on and off or lie in bed. I did not feel this way ever with my first two kids or my 2 other pregnancies that end in miscarriage several years ago.

Has anyone experienced depression hitting again with the hormone changes of pregnancy? Did it last for you?