Oxygen levels ??

[Lifesforloving1]

Hello !
I brought a I watch a few months ago, every time I do the oxygen levels it’s always 98, 97, or 100 ( range )
Today…. I was in a shop with a really fluffy jacket on, I felt awfully warm. I did my oxygen levels and it was 91 ?
I begin to worry….. I did it again about 5 mins after and it was 98 again ?
Is this normal ? I felt much better when I got outside. Also I’ve got a pulled back. ( not sure if that’s anything to do with it ?
Thanks x

It will just be a blip, doing it in a shop when you were hot and flustered will be to blame. Don’t worry.

support.apple.com/en-gb/guide/watch/apdaf17aa5ef/watchos
Measure your blood oxygen level
Rest your arm on a table or in your lap, and make sure your wrist is flat, with the Apple Watch display facing up. Tap Start, then hold your arm very still during the 15-second countdown. At the end of the measurement, you receive the results. Tap Done

Even under ideal conditions, your Apple Watch may not be able to get a reliable blood oxygen measurement every time. For a small percentage of users, various factors may make it impossible to get any blood oxygen measurement

@MeetMeAtOurSpot
Thankyou very much ! xx