Clothears, I want to add mine and my sister's story to see if can help at all.
I had an abortion when I was 18. At the time I felt much like Blu about it, to me it was something that was stopping me doing what I wanted to do with my life at the time (about to start university). I never felt like it was a baby at all. Fast forward 20 years and I became PG with DD. Having previously barely thought about the abortion for 20 years, I was faced with overwhelming emotion about what I had done all those years ago. I knew that it was the right thing to do at the time and that this time around the baby was much loved and wanted, but there I was, imagining what might have been. I am pregnant again now, and it has been a struggle for DH and I to conceive. I think of how different things were when I was 18.
I spent my 20's trying not to get pregnant, and my 30's trying desparately TO be pregnant!
My sister has 2 daughters each with a different father. She split up with DD1's father when her DD1 was 18mths old. She became pregnant with DD2 a few months after meeting her dad. My sister initially wanted an abortion, but she couldn't go through with it. Having been PG once before and now had DD her thoughts had changed on abortion. She went ahead with the pregnancy and married her partner. However, DD2 was not an easy baby like DD1 had been, sis had PND, was living far from family and had little support from her new in-laws. The marriage eventually broke down and she moved to be closer to her family. She even moved back to mum and dad's for a while with the two babies, which was a terrible time for her and my parents. Her life was hard as a single mum, even with family being there for her. But now the girls are 14 and 11, she is about to get married (for the 3rd time!).
She does not regret having kept the baby (DD2) and cannot imagine what life would have been without 2 girls. BUT - she split with DD2's dad - in spite of him saying he wanted to marry her and have the baby, he was not right for sis, mourned his single life and was not ready for fatherhood.
ALSO, sis had 6 months of hell with little or no support, PND and a new baby, until she finally split with him and moved back where her family were.
I am not saying that these terrible things will apply to your situation, but you need to consider everything - support from family, your new partner, how you will cope with two small children - before you make that decision.
Expat has given you fantastic advice, please, please see a councillor about this, and make a list of the things you need to think about.
I am pro-choice on abortion, but for me, personally, right now, I could never consider a termination, even though I had one all those years ago.
I have probably not helped much.
Good luck in whatever you decide. It is the hardest decision a woman ever has to make.