When should I test on a 32 day cycle?

Im currently on CD26/13DPO. I'm just wondering when I should take my FRER test? AF is due New Year's Eve. If I have longer cycles should i wait longer to test? I only have one more est and really don't want to buy anymore (unless it's a BFP). My OPK was positive on December 13/14 (took it late at night) what do you ladies think? PLEASE HELP!