Did I test too early? Please help!!!

Savannah

So I have had headaches starting this week, had nausea started this week, have had mood swings, and am just feeling off. I took a test this morning with FMU and got a BFN. Did I test too soon? AF is due tomorrow, but I have had cramping on my left side and have been feeling hot a lot and am normally always cold. Any advise would be helpful!!!