Gave my first real code review comment and got polite silence back — now I'm assuming the worst

Left a genuine review comment, not a nitpick, on a mid-level engineer's PR two days ago. They reacted with a thumbs up emoji and nothing else. No "good catch," no pushback, nothing. Rationally I know that's a completely normal response and probably means it was fine. Irrationally I've reread the comment eight times looking for a tone problem that isn't there. Does this feeling fade with more reps or is this just what code review anxiety looks like now?