Depression during pregnancy

Has anyone ever experienced this? I never had it with my first baby. But I can’t help but fear I may be experiencing it with this one. I have zero motivation for anything. The only thing that gets me out of bed is the fact I have to care for my first. I have zero interest in sex. All I want to do is sleep. At work I half ass everything doing bare minimum just to get through the day (which is not like me). I am excited about this baby, & up until the last couple weeks I had been feeling that way but it’s like this dark cloud has started glooming over me & I don’t know how to shake it, I’m not feeling like suicidal or anything like that or even close to that, just feeling down. My SO is trying so hard to be supportive but even he is feeling lost in how to help 😔