Heart rate spike after injection — should I be worried?

Resting heart rate is normally around 70. The day of and day after my Mounjaro shot it's been climbing to 90-95 just sitting on the couch. My BP is normal. No chest pain or anything scary, just feels weird.

My doctor's office said "that can happen, monitor it." Anyone else experience this? It mostly goes away by day 3 post-injection but I'd love to know I'm not the only one.