Adult Pertussis Vaccine...?

AutumnLeaves2

I got the T-Dap shot yesterday, which is to prevent the spreading of pertussis to my baby once she's born, at my 20 week 6 day appointment and it was probably the most pain-free shot I've ever received in my life! I woke up this morning, however, with a huge bump over the injection site that feels like a bruise when you press on it. It also hurts to flex/straighten my arm. Is this normal or is my body reacting weirdly to it?