No baby bump!

Rebekah • 24 year old married momma. Ryder 5, Vaida 14m pregnant with out last baby due may 2018
I'm 16 weeks today and literally have no bump. With my son I popped so fast. I figured since this is my second I would pop faster. Nope! People at my work keep saying where is she?  ( my baby is a girl) I just can't wait to have a little belly