Hey ladies! I need some insight. So the first day of last cycle was April 25th. According to Glow my period is not supposed to be here until May 24 (30 day cycle ). My periods are regular every 28 days . Last night I started feeling cramps and I thought it was a little earlier than usual to feel cramps, and when i checked in another and calendar in my phone my period is supposed to really start May 22 (28 days) . Ovulation times are of different also in two apps. Has that ever happen to any of you?