happy/excited but also guilty

After a couple months of trying for our second baby, I got a positive test! We are sooo excited to be adding another addition to our family but I’m feeling a lot of guilt and sadness about the fact that I won’t have much more one on one with my first… My daughter just turned 1 on Nov. 2nd, she’s my rainbow baby! I’m scared my daughter won’t get enough of me when this new baby comes, I’m scared she won’t be happy about having a younger sibling (she has an older half brother but they’re 7 years apart)… Is it normal to feel this way?