Insatiable appetite all of a sudden (37 & 4 days)

Rocio • First time mommy! Hubby and I are so excited and can't wait to meet our "sunshine!"
So I did pretty good throughout my pregnancy and only gained 18lbs (started off as a size 14 so couldn't gain too much weight). However, this week I suddenly have an insatiable appetite! Worried I'm going to blow up in the last two weeks of my pregnancy. Is a sudden increase in appetite normal??