Missed 3rd trimester Tdap

So I didn't know I was supposed to get the Tdap in 3rd trimester. It was never offered to me and now I'm worried about my baby catching all the things (of course he probably won't). I've read he can get the Dtap at 2 months to start the series. In the meantime Ive been told not to take baby out and avoid anyone sick. Anyone else find themselves in my boat with any words of wisdom?