Grieving as my body is weaning for me

My daughter is 21 months and still nurses for naps and bed time, and sometimes in the morning in bed if I need a few more minutes to wake up. I went out of town last weekend for 2 days, and I came back and my supply is significantly reduced. She’s even signing “all done” quick because I think I’m running out. I knew we’d do it soon, but had a plan for doing it with a celebration and preparation. I’m sobbing writing this because it’s a special time for us. She’s my last baby and I love when we have milkies, she even signs it and seeing her open and close her little fists is just so cute.