Im a horrible mother 😭😭😭 please don’t judge me.

I have a two year old little girl and she is my whole world. I love this little girl more than life but she exhausts me. Now were pregnant with our second baby. We tried so hard to get pregnant with this second baby. Now I am scared to start over. My daughter is potty trained. She is sleeping through the night and is semi self sufficient (can walk to the car, feeds her self, can talk and tell me what she wants.) I am so panicked that I didn’t think this through and I don’t know if I really want to start all over 😭😭😭 Please tell me this fear will pass and I’m not a horrible mother. I feel like I’m so selfish.