Depression while pregnant

Er
I've been feeling really down lately.. I just get sad and cry and the littlest things bring me down. 
I feel bad for being upset because I have this beautiful little girl growing inside of me.. I'm about 30 weeks along.. I was fine until about 3 weeks ago. That's when all of this started.
I just don't feel like myself. I look in the mirror and get sad because I don't feel pretty.. My husband is supportive but sometimes he just doesn't understand that I'm sore and tired and still expects me to be able to do everything around the house and I just can't... 
Help! 

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