Waves of feeling really good... (like a bunch of endorphins have just been released) Anyone else?

Is this normal or something other people experience? I tried looking into it more online but I didn't find too much.

The last week or two, I have noticed at random parts of the day, I get a wave of feeling really good, like really happy and calm suddenly. They are short-lived moments, but I feel them several times throughout the day. Anyone else experience these bursts of endorphins/oxycotin (I am not sure what it is) or heard of this happening?

For context, I did not have any mood disorders pre-pregnancy, take anxiety meds, or anything like that in the past. I did see a couple posts about people who have been on anxiety meds feel happier/more regulated since pregnancy.