So I was supposed to start my period this week, and didn't. According to glow, I was supposed to start yesterday. I had very little spotting last night and then nothing until like 10:30 this morning. It was like I started my period but then nothing for the rest of the day. TMI but it was like I was just barely spotting when I changed my tampons. My period is usually regular flow the first couple days. Nauseous last Friday, Saturday and Sunday. Stomach ache all week. Cramps.... I don't get cramps hardly ever. And a gnarly headache. What's going on?