Ok so it may jus be me but I doubt it...when I originally set my period on the calendar it said that it would be on the 23rd of Dec, then the app said I started my period yesterday...then I deleted it all together and it defaulted my period for the 21st. I have had AF SYMPTOMS for an entire week...two things were not the same though...1: my nipples were sensitive 2: I was very nauseous...now there isn't any spotting and I kno only 30 percent of women have implantation bleeding...not worried about that however I think it's fair to say I missed my period I am 12dpo and still a BFN...idk what to do...I guess all I can do is wait and hope for my Christmas miracle!!!