Feeling alone and struggling emotionally

I'm really struggling today. I'm currently 16 weeks pregnant and feeling so alone even though I'm obviously not. My sister in law is also pregnant (20 weeks) and she is getting all the attention. I'm the outsider as I married into their family but I'm also pregnant with their grandchild and they act as if they don't even remember most days while praising their daughter. I get it, she's their daughter. I just feel alone because I have no family here at all. My parents both died within the last 2 years and my siblings all live in different states. I just feel like she has no clue what I'm going through. I'm excited also that we're expecting but I have no one but my husband and my current children to share that with whereas she has her whole entire family right there to constantly get praise from. Don't get me wrong, I'm not the kind of person who likes a lot of attention but a little a knowledgment would be nice once in a while. We have a 1 yo son who they barely pay any attention to at all. He is the most adorable thing in the world and so loving but they act as if he's a stranger. I mostly just wanted to vent since I don't have anyone to talk to about all of this (my husband doesn't understand as he is all up his family's butt and blind to any of this). Anyone else have a similar situation or experience?