Mixed feelings about this pregnancy

Hi All, please can you be kind and give me some reassurance. I just found out I’m pregnant with my second. It’s planned but it’s happened VERY fast. This is literally our first month of trying so I’m still in shock and not mentally prepared. I thought I would be happy but since I’ve found out, I’ve just been crying the whole time. I feel really guilty for my daughter. I love her so much and I can’t imagine not giving her 1000% of my love and attention to her ( I know what you are thinking, we put ourselves into this situation, got no one else to blame ). I feel like we’ve now had our life back. My daughter has such a good routine and sleeps perfectly throughout the night. I know the newborn baby, the lack of sleep stage won’t last forever but it still worries me. I don’t know what the bedtime routine will look like again, my husband works nights so he’s not here; How am I going to cope with a toddler and a baby on my own? Who should I put to sleep first? The only good thing is that my daughter will be at nursery for 3 full days a week when the baby comes. She will be 3 when the baby arrives. Please can someone who’s been through this give me some advice and reassurance. How do you get over this guilty feeling and worrying? I’m the only child in my family so I’ve never experienced any feelings of having a sibling (I think that’s also why I wanted a second, I don’t want my daughter to grow up alone). Thank you so much.