Pregnant and strange feeling. I want my stepchild by not my own baby?

[Teresa]

I'm pregnant and having strange feelings. I never thought I would feel this way. This is my first child and I thought I would be happy, but I'm not. I like the way things are now. We don't have lots of money, but we are happy. I like that it is just me my boyfriend and his little girl. She is 5 and when ever we all hang out she makes my day. This is strange, but I'm thinking that I don't want a baby. I like my stepdaughter because I like to listen to her fun stories of books she is reading in school but at the end of the day she goes back home to her mom. I know that when I have this baby that everything will change. I will be responsible for someone. This is crazy how could I feel more love for my stepchild than my own baby? I'm only 4 weeks. I just don't know if I'm ready. I can't send my own somewhere else at the end of the day.