I don’t feel happy about pregnancy

I have a ten months old son, and my husband and I decided to ttc for number 2, and now I am 8 weeks pregnant. I really wanted this baby, but now I am scared. I do not feel happy; only worry about how things will go with two little children. Perhaps it are just the hormones, and I feel so guilty about not being happy. Anyone else recognized these feelings? And are there moms here wo have children with a small age difference? I really need to here some positive experience.