It is not uncommen for someone to want a child aborted. It is an option. BUT you didn't and they are here and they love there dad. for the record my mother wanted me to give up my DD who I had at 16, but not now. and you know what My DD knows this and is okay with it. People make mistakes.
If you do not come to terms with it, it will eventually effect the kids. they will pick up on your feelings towards dad. They will push a button and you will snap and say the wrong thing. And it's not going to be something you can take back.