Feeling guilty about baby #2

I just found out I’m 6 weeks pregnant with my second baby and my first is only 4 months old. This baby was not a mistake but definitely a surprise. My DH and I were only using pull out method so I knew there was a chance. Even though we wanted to grow our family again I can’t help but feel bad when I look at my sweet baby. I know she has no idea what’s going on but I don’t want her to feel neglected. I feel so sad she won’t have much time as our only baby. I know I’m being emotional just hoping other moms with close babies can help me feel better