Does anyone use countdown to pregnancy?

Massy • Mommy of preemie twins born at 29 weeks with IVF fresh transfer
According to glow my AF is due tomorrow and I am pretty sure I ovulated on the 18th. So I would think I am 11dpo today. 
Well when I put the same dates into countdowntopregnancy.com with an 11 day luteal phase it predicts that I am 9 DPO today. 
Can this be accurate???????? ????
Well I know, the best way to know is waiting, I guess :/ 
Please send some baby dust this way! 
Thanks to all