How would you handle this?

I am 35 weeks pregnant with my second baby, but my husband's 3rd. This will be baby #4. All of the other babies are no longer babies really (though in my mind they will always be my babies). They are 17, 18 and 20.

I found out yesterday that my older child (he is 18) is going to be a daddy in August. So I will be a mom of a newborn and a new Grandma within 5 months of each other.

I am not sure if I am overly happy about it all.

How would you handle it?