Glow says AF is due 8/1. Starting this past Thursday evening while laying in bed, I've had cramping. Friday it felt like period cramps then continued throughout the day Saturday. Nauseous off and on and feeling cramps again today after they simmered down for about a day and a half. Lower back pain and some side twingy cramps. Woke up this morning with back pain so bad I could barely move. Feeling extra tired like I can't get enough sleep. AF due Saturday.