I just wanted to wish you luck over the coming months. I hope he snaps out of it & realises he's just scared.
If it turns out he really doesn't want to be with you then it's best not to try to force the relationship to survive.
Please contact some relatives or good friends who can be there for you over the coming days/weeks etc as you will really need the support if you don't have it from your ex.
If you need to be a single Mum I'm sure you will do a wonderful job. Try not to stress too much (impossible I know!) & think about your beautiful baby who will be in your arms any day now, she will need you more than you've ever been needed in your life.
I believe once you look into her eyes you will know everything will be ok.
Sending a big hug & I hope things start to look up for you soon. The timing just couldn't be worse!