The advice in this forum, based on the current reality, is that
no further testing is needed after 3 months if
one had a real risk.
But if
one is unable to accept that, and feels that testing further out to 6 months is the only way they can get a peace of mind, then by all means go ahead. No one can stop the person from doing so.
(maybe except to advice the person to seek psychological help)
BUT ALL OF THIS, YOU DON'T HAVE TO WORRY, because it has nothing to do with you.