Less movement after tdap vaccine

Nikki • Mom to 7 year old girl and newborn boy!

I just had my tdap vaccine yesterday at my monthly check up.

Today my arm is a little sore, just like it was after the flu shot.

My concern is that I don't feel my little guy as much today. I feel him a little, but not like he was before the check up and vaccine.

Is there are correlation between the two? Or is he just having a sleepy day?