Hi, Heather
I read your post,and Meanon is right. You have to live with this decision or situation (meaning "persons"

) for the rest of your life.
You can have children whenever you want. Prefferably when you can provide food on their table also. If you can have enough money to send them to a good school, that's even better.
The main point, Heather,is that you have to want this baby.For you.Not for Greg or for Noah.
Not so long ago,you were ready to leave your bf.Did he pay you back? Let's assume he disapears. Can you financially afford to raise 2 kids by yourself? Raise them when they'll be 16,two cars, 2 college funds,etc,etc.
Think and se what it is that you want and what it is you can handle. I pray for you to find in your heart the courage to make the decision you feel is best.
Love,
Twinkle