Pregnancy Depression?

I’ve found myself getting into spurts of depression lately, I thought being pregnant would be a happy exciting time, which it has been occasionally but honestly it’s take a huge toll on me emotionally and physically. All of my friends bailed on me because they have insane drinking or drug habits and my mom has been out of town working for months now so she hasn’t been there the way that I had hoped.. my boyfriend and his family have been supportive but I feel like sometimes I take it out on him. He gets frustrated and it makes me even more sad because I try to help it and I just can’t. I haven’t been myself at all and he thinks it because I’m cheating or leaving him. I haven’t talked to him about the way I feel and I think I should, it’s just very hard for me to open up about this stuff because I’ve never talked to anyone about it before and I don’t think he would understand. I don’t want to leave the house, even to go do simple tasks like grocery shop or go to a gas station. My appetite hasn’t been the best, which I feel like an asshole for because I feel like my baby isn’t getting enough nutrients because I don’t think I eat enough to support her and myself. I feel very self conscious of the way my body has changed, I have stretch marks on my boobs and they leak constantly, I’ve gained a lot of weight in my face and all around I just feel disgusted with myself. Should I talk to my doctor about the way I’m feeling? I’ve never talked to any doctor about my struggle with depression because most of the time I’m able to use coping mechanisms a counselor recommended and after a few days I feel better but this has been an ongoing struggle for all 7 months of my pregnancy and I feel like I’m at a loss. Does this mean I will have postpartum depression? I usually don’t ask for help but I’m desperate to feel like myself (mentally) again. I have no thoughts of suicide or harming myself/others. I just can’t shake this funk I’m in.