Separating from husband

My husband & I have several issues mainly stemming from drama from his previous child mother/child and him not stepping up in the marriage as much as I think he should. We were in a great space for a while and wanting to start a family of our own. Now I may be pregnant (AF hasn't shown up for a week and it's never late), and we're separating temporarily. I'm so heart broken and a little relieved all in one. My emotions have been all over the place. I thought I would be so happy as we wait to find out if we're expecting but that dream is over.  I'm also stressed now as I don't know what I'd do if I find out I'm pregnant and we're in such a bad place.  Has anyone gone through anything similar? How do you get through this?