Any other Oct 16 mommas expecting baby #2 and are sad for their first?

I honestly feel so bad for my sweet beautiful perfect daughter. She’s only 16 months old, so she doesn’t fully understand that mommy is having another baby and what that entails. For the past 16 months the world has revolved around her. She’s our everything. Of course we’re excited to expand our family.. but I don’t want to have to share my time with her. I love her more than anything, and it breaks my heart that she’s not going to get every ounce of my love once her brother gets here in June. Are any other mothers going through this right now? What can I do to make sure she knows I still love her as much as I always have?