Will you be getting the Tdap vaccine?

I keep seeing this suggested advertisement pop up on my Facebook. It says we should all get the vaccine each pregnancy because it prevents against whooping cough. But the standard Tdap shot last five plus years. I had one done with my first 4 years ago so I'm undecided if its something I should get this time or not. What are you ladies doing? Any one had it before and aren't getting it done this time?