No sign of af

April
Ok so af is due tomorrow. Normally I have signs of her showing up. Cramps and spotting the day before. This time i have nothing. No cramps or spotting. I had cramps last week. I am constipated. Headaches all last week my temp is elevated and I feel like I have a cold. I dont have a lot of symptoms. I have bouts of nausea but not all the time. What the heck is going on? Took two tests both negative. I dont want to get my hopes up.