AF is usually 24-25 days apart for me.  One app has be due on 1/25, Glow has 1/26.  Yesterday, 1/21..I got up to mild cramping, then i felt nausea during breakfast, and lower back pain.  I feel this is really early, anyone else have symptoms this quick?  I haven't tested yet, was trying to wait until at least I missed period.  With my son I tested 2 days before missed period got BFN, tested again on day of missed period and got postitve with Clearblue digital.