I feel like a terrible mother

With my first (16 month old little girl) I tried for her for over two years. Did everything I could to have her. Lost two pregnancies in the process. Prayed, cried and begged for her. Then when she came into my life I felt complete. Her father and I did not work out by any means after six years together, we split. Still wonderful friends but not good at dating eachother. She is my life. My pride and joy and I would do anything for her. I never doubted my love for her. Now I’m pregnant with my boyfriends little boy. His first. And I’m finding it hard to believe I can love him as much as I love her. This one wasn’t planned and in the beginning I was angry at myself because I didn’t want him. I didn’t want to sacrifice the love for my daughter for something I didn’t intend on having. My pcos was flaring up and out of wack and it was a complete accident. Now that I’ve had time to expect the change I still don’t know how can I love them both just as much as I love the other. My daughter is my world, without her it’s like the air has left my body. I’m just afraid that I won’t feel like that when her brother is born. Please no hate y’all I’m already tearin myself up over it.