Seperation anxiety!

I'm 24 weeks pregnant and a stay at home mom. Every time my other half leaves I get so sad. I just realized the pattern last night. I really thought I was depressed but when he leaves for work, the store or even out the room I get so sad. I even cry randomly  throughout the day and just sit around sad. I try to keep busy but the feeling does not leave until he comes home. I hate it. I was not like this before. Has anyone ever experienced this while pregnant?