A simple pulse/oximeter would alarm if your blood oxygen level fell too low, but that’s like the idiot light that tells you your car has overheated: by the time it comes on, your engine is already too hot.
A more advanced unit keeps a record you can load up and see a continuous chart of blood oxygen throughout the night; that would reveal whatever dips there might be that weren’t severe enough to trigger the alarm.
For a definitive confirmation one way or the other, an in-clinic sleep study is the gold standard, and the heavy snoring is a caution flag. I’d seek a consultation, and see.
One other sidebar, my pulmonologist said my test results shocked her; that, out of a lineup of 100 people she’d have never picked me out as a possible apnea patient. And yet, I am, and a severe case, at that.
I call it ‘slapnea’........That’s what my wife does when I snore and wake her up!...............