Pregnancy Depression 😔

So pregnancy depression has hit me hard today, which is so awful because I was doing good (meaning I have depression- outside of pregnancy and I was getting out of it and noticing it less.) but today it was like I was walking through happy town frolicking through flowers and I turned a corner and a brick hit me in the face, and that brick was depression. And now the brick is stuck to me..... it's really kicking my ass. I don't want to get out of bed, I don't want to talk to anybody, I don't want to go anywhere or do anything. I'm not sure how to battle this because whenever I get in these bad of funks I usually smoke, drink, or I'm a recovered self harm addict... which I fall off the horse sometimes but recently (before becoming pregnant) I've been really good about not doing it... I still want to so bad though. Anyways, seeing as I'm 13 weeks and 2 days pregnant I can't resort to any of my past methods. And I thought about going for a walk through the woods or taking a drive but then we come back to, I don't want to leave my bed. I'm not depressed about the baby; I love my baby so so much which is why I refuse to do anything to hurt it. I'm just dealing with my fiancé having a kid and ex fiancé (which has literally NEVER bothered me before because we all have pasts but for some reason today it hit) and I'm dealing with being second.. and what if I'm not the family he wants? And what if that was what he wanted, she left him so I can't even use the "well he's with you" to feel better. He doesn't talk about her with me, and they don't have contact since she's a raging bitch and won't let him be around their son... but it's still, for some freaky stupid reason I can't stop thinking all these things about how I'm just the backup accidental family he got from a screwed up situation. This ended up being really long but I didn't know where else to complain... mainly because I don't want to talk to anybody I'm close to. So, is anybody else going through pregnancy depression? Is this even a real thing? How are you coping?