My AF was due on 1/1 but didn't show so I told glow it was late. It has now changed it to 1/3 but I have no signs of it showing up soon. I tested on the New Year's <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> night but got a BFN. Could there still be a chance? How much longer should I wait? Has anyone else had this happen and then got their BFP later than expected?