Marriage separation while pregnant

Hi Ladies
I’m currently 17 weeks pregnant with our 3rd baby. This pregnancy wasn’t planned and quite a surprise given our 2 other children were conceived via fertility treatment and IVF. Our youngest is 2. Before finding out I was pregnant I wasn’t completely happy in my marriage. We’ve been together 17 years, married for 10. I just feel we have lost our connection, any common ground etc
We hardly talk, as in conversation other than the children/housekeeping type details. We don’t do anything socially together. Anytime we attempt to engage in conversation feels like just results in conflict so i just stop talking altogether to avoid a fight escalating. Recently I attempted to broach the subject of couples counseling with my husband which immediately resulted in an argument. I don’t know if he’s in denial about our lack of relationship or just too wrapped up in his own world to give us a 2nd thought. My question is do I just keep plodding along for the sake of support and the family unit and readdress things after the baby is born? Or has anyone had a seperation whilst pregnant from a long term relationship and how did things go? I just feel so unsure, lonely and confused about what is the root of our ‘problems’? Are we just in a rut? Is the relationship worth/able to be re-established? Of course I want a happy, healthy, fun, committed, enagaging, fulfilling relationship (who doesn’t!) but none of these words resonate whatsoever with the place my relationship is in currently. And if I’m honest probably hasn’t been for years.