Yes, most definitely.
I had noticed this even before I started PE.
There could be up to a half inch difference in NBPEL depending on the day.
I’m not sure what the actual cause was/is.
Could be sleep the night before, confidence levels that day, or maybe even which way the wind was blowing.
I’m pretty sure this is completely normal.
It also makes me wonder if the gains when first starting to PE are down to increased confidence.
As in, you become more familiar with your penis, show it some love, become more in tune with it.
That, in my opinion, surely makes you more confident with it.