Toddler and new baby...worried...

I have a 23 month old little girl, and am having a csection in two days to welcome the new baby girl to our family.. this week has been an absolute roller coaster for me. I’ve been doing my best to make this week as fun for my daughter as possible, because it’s her last few days as my only baby.. my heart is literally broken, and I’m grieving that thought. :( I feel like a terrible mom for saying this, but she’s my little best friend, and I don’t know how my heart will ever love another baby as much as I love her. She is absolutely my world, and I love spending all of my time with her, and her being my priority. I’m TERRIFIED that she will resent me for not having enough time for the both of them, or she will think I replaced her, or don’t love her as much.. please don’t bash me for this. I’ve cried myself to sleep night after night about all of this already. How do you love two? How did your toddler adjust? Is your relationship with them still the same? I’m so scared, mamas :( so so scared.