In last two days my Apple Watch has had random spikes

In the last two days my Apple Watch has had random spikes. I don’t feel anything when this happens. And I am pretty attuned to feeling sensations and when my bpm is increased and if I am working out. It seems these last seconds, wouldn’t I feel this? My watch wasn’t too loose but it probably could have been a little tighter. On the one I went to 138 I was on a leisure walk with my child and the one where it went to 148 I was pushing my child on a swing.

[Re-Titled by Moderator]