Also, if she is truly pregnant try to be respectful. You don't know what she is going through - shame, disappointment, feeling yet again she messed up, let her family down, how is she going to manage, etc.
I found myself unexpectedly pregnant, long distance relationship but I never insisted he marry me but expected him to support me and be involved. I tried to look at it from his side of things - he wasn't expecting this either. We had previously discussed getting M, kids, how we would raise them. It was a long term relationship.
I had SEVERE vomitting for 8mo of my pregnancy. Worked full time to keep a roof over my head. I had minimal support. He became very wishy washy. Pregnancy hormones didn't help either. Ultimately he uprooted his life to be near me and our son because given the situation that we did not marry I needed the support of my family. I had to go back to work full time when baby was 7weeks old because I had to continue to keep a roof over my head and now my childs. He was decent enough I suppose the first year but then bailed.
Sure - maybe this is all fake an ploy to hang on to you. Maybe it's not. Maybe now is not the time to expect her to come chasing after you however. You need to think about ways you can step up here. Don't commit to M but think about ways you can step up to ease whatever it is she may be going through.