My wife had it 2 months ago and we slept in the same bed throughout and I never tested positive. She tested negative at first before finally testing positive. She had a mild chest cough - no fever or anything else.
My 4 year old had it a month ago. The cold my unvaccinated 4 year old had a month after having COVID was much worse than when he had COVID - which basically consisted of him running around destroying the house for 4 days without even a single sniffle. The only reason we knew he had it was because the unvaccinated ages (Pre-K) have to test to stay on any reported close contact. The older, vaccinated kids don't have to if they aren't showing symptoms. We tested the 4 y/o at home and he was negative, popped positive at the school test. Whatcha gonna do
My 7 year old (vaccinated) had a minor cold prior to my 4 year old testing positive but continuously tested negative. My guess is that he had it but the tests didn't pick it up.
I also had a bad flu like illness in December 2019 that tested negative for flu. I would not be shocked if it was actually COVID. There's a few studies that think it was already here by late November and nobody realized it.
So yea I'd bet good money that I've had it at some point. Probably multiple times. But I've just never gotten a positive test for whatever reason.
I work around large indoor crowds, taken many flights, and have to Petrie dishes (aka kids) at home, and somehow I've yet to have a positive test (knock on wood).