Not sure why I'm feeling like this..

Hi there. Not too sure if I'm posting in the right group, but I'm looking for advice. I have a 1.5 yr old and just found out I am expecting. My husband and I were trying, but were still surprised. I am excited, but for some reason I feel soooooo sad for my son. He is my world and my baby! And It really makes me sad that I won't be able to give him the attention that I give him now. It breaks my heart thinking about it. Am I just being hormonal or is this something someone else has experienced? I've never heard anyone say anything like this and when I try telling family all they say is that my son will be ok and it will all work out, which I know it will work out I just wasnt expecting to feel sad for my son. Thanks for listening. Just letting these words out helped a bit.