I GOT PREGNANT! But now my daughter is not happy!?

hi there! I am Terra and i am 44 years old! I jut found out that i am pregnant! I am pretty happy about it since it is my first one,but my daughter Alison isn't. I adopted Alison when she was 2 and now she is 12. I really want to have my own baby all my life but the doctor says that I can't, now i finally got one my daughter is not happy. What should i do?