"I know we haven't spoken in a while. I didn't call you here sooner because the one change happened shortly after the other, and I was embarrassed, and now I've just let things go too long, but I owe it to both of us to have this talk.
So yeah, two surprises. I was human when you knocked me up, and now I'm not. I really don't know what that means for the baby. And...I could really use your help. I heard you haven't found anyone else since we split amicably, and since then I've realized I've been missing you. Would you be willing to at least discuss some options?"