I am now 15dpo I'm due to get AF today. For past 9 months I've only been late one time due to high stress due to a loss of a dear long time family pet (26yr old) horse of mine.. so far I've taken 1 HPT on 10dpo and it was BFN.. i haven't taken another cause I don't want to get my hopes up. Should I take another PT in moring which would be 16dpo if I dont get AF by morning or should I wait longer?