why not go now. They won't give you a stamp BEFORE your current stamp. It's such a ridiculous excercise that can be entirely avoided! Now you don't lose the days ..... only on first extension... you're wrong. Go now and stop making yourself crazy lol I have 3 extensions. Never lost a day and never went in LESS than 20days before expiry .
Why don't you first walk in and try and get a covid extension before it expires before worrying about "what ifs". It's not like there will suddenly be fewer or more options ....
The answer is yes from personal experience after you receive first negative result. Covid isn't the worst thing you can catch in phuket though (speaking for a friend)
Why have you made 10 different posts about the same thai pass application ? Seriously lol. No one can guess what the problem with your application was....