Is/has anyone been terrified of favoring one of your children?

My hormonal ass really needs to stop watching This Is Us. Had me crying like a baby..And honestly feeling anxious about some deep seeded issues. 
I'm pregnant with my second daughter and I'm all kinds of worried I won't have the same bond with one than I do with the other, or my husband will love his blood more than my first/his step daughter. We have to share custody with my first daughter's dad so I'm also worried it'll be hard for her to only be with us half time while her sister gets to be here full time. 😭😭
Any advice to talk my crazy emotions down? 

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