when should I️ retest?

Period was due Nov 9th, I️ tested on that day and got a negative. Though I️ swear I️ saw a line- it could have been an indent. But it’s now the 16th and I️ still haven’t seen AF. I️ spotted for a few days starting the Nov 6th. I️ want to test again but don’t want to waste money. I️ want the most accurate reading.