HELP! -ve FRER at 12dpo-what are my chances?

Katie • 27 years old, married
Urgh. Fed up. Please help me!
​Did anyone get pregnant with these circumstances or think I have any chance? 
​ 
​Ovulated later at cd17 so + 14 days luteal = AF now due Friday 18th (was today).  Tested today with 10miu and a FRER and nothing but BFN. FRER packs say detects pregnancy 3days before AF in 98% of women so now feel very much out of the game if only 2% chance for me!
​Iv had a high temp for several days that dipped today (the day I would have been due AF) does this mean anything? 
Could i still have any chance? 
I had hoped this 'extension' on my AF coming was a good thing but now thinking it's just dragging out my next window to try again. Giving me false hope ??