AF is a week late and negative pregnancy tests

Hannah β€’ momma of a πŸ‘ΌπŸΌπŸ’•
My AF is a week late. I've done 3 tests throughout the week and they've all been definitely negative. I have the sorest breasts (they feel like they're bruised), hungry always, and exhaustion.Β 
Has anyone else ever had this happen to them? Do I just not have enough hCG to get positives or could it be something else?