AF almost a week late!

So tomorrow af will be a week late. I have taken several tests over this past week and all have been negative. I am showing no signs of AF showing up either. I have been extremely tired the last two weeks, my nipple have gotten a little darker and my breasts are sore to the touch. One day my appetite will be through the roof and the next I'm not even hungry at all. I have also noticed that my sense of smell has gotten stronger. Can someone please tell me that they have had the same symptoms and been late for AF but not getting positive hcg tests till way after AF was due? This is really starting to make me worry.