Glow predicted that I would start my period on April 7th. On April 4th I bled a little and had one very bad, mildly long-lasting cramp. I thought It had come early, but I kept checking my liner and it was clean. Used one a 2nd day just in case - still clean. So I waited.. The 8th came and went am I still didn't worry much or get my hopes up (want a baby but have medical problems) because glow is only an app and can only predict, not guarantee.. Last month I started on the 18th.. Well now the 18th has come and went and I'm usually within 1-2 days of the last month.. I know I need to call dr if this keeps up but I'm just not sure if it's too soon. I've had symptoms that could be pregnancy, pms, OR my medical condition(lupus)! It's frustrating! Had them pretty much since that day of cramping on the 4th. Not cramps but sore breasts, feeling bloated (but also have kidney failure), sometimes even mild cravings for things I don't usually like and ordered a salad with ranch (my favorite dressing) and it was disgusting! Tasted like soap! So later, at home.. I used some hidden valley ranch with my meatballs to see if it was a cheap brand... Didn't like it either.. Agh! Frustration!