Second time (or more) mommies

Anyone else really losing it over their youngest no longer being the youngest soon? I love my little boy so much. I just can't believe I'll be having to share that love with another child soon. Its hard to imagine... I don't know I've just been clingy with him lately (he's 2). And I want to snuggle and love him all day because I know any day now his little sister will be here.