Don't know how to feel....

I really am struggling with how to feel right now......let me give you a little background.

I'm 40, my husband is 31. I have 3 children (16,18&19) from a previous marriage. My husband had no children of his own.

We've been ttc since March. I got pregnant last cycle but sadly, miscarried on Father's Day. It was horrible to have to tell my husband I was losing the baby on Father's Day!

Fast forward to yesterday. (5 days after I miscarried). My 19 y/o tells me she's pregnant.....I'm trying very hard to separate my ttc from becoming a grandma, but I can't. I don't want to be a grandma right now.....I want to be the one who has a baby! I want my husband to have his own baby!

Now, don't get me wrong, any baby is a gift from God, but I really don't know what to feel.....

Anyone else experience this??