Second pregnancy and feeling guilty

I’m currently pregnant and I have a one year old. When my baby’s born my daughter will be 20months. I’m feeling guilty about getting pregnant so soon. I pictured it being just us for a while but turns out I’m pregnant. I’m scared of how my daughter will feel when there’s a new baby. I don’t want her to be upset since she’s used to getting so much attention. Has anyone felt this way before? How was is with a short age gap? How was it when the baby came?