Depression (stable during pregnancy, worse after birth?)

Before I was pregnant, ever since I started puberty I dealt with depression and think I have PMDD. Since I've been pregnant (37 weeks), I actually am more stable, happy, less anxious, less emotional, and just better overall.
Has anyone else experienced this? What happened after birth? 
I'm nervous about how bad it will be after birth because I feel like it must be my hormones and they have leveled off during pregnancy, but will it be really bad after?

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