Someone Help? Almost two weeks late but BFN tests - any chance?

Hello Ladies,

AF was supposed to arrive January 15th according to my period tracker. I have been logging my period for over 2 years and this app has never been wrong as to when I am supposed to start my period. There is absolutely no sign of her showing up. I have been feeling sick to my stomach, major heartburn, feeling bloated, extremely tired, a strange pressure in my lower abdomen/back, my breasts have been feeling heavy and very sensitive.. I could keep going on and on about everything that I am feeling. But I keep getting BFN's. I have tested a lot and they're all negatives.. What do you think is going on? Do you think there is a possibility of me being pregnant? Am I going crazy? Have any of you been pregnant and just got BFN's? 

Also, I'm sorry if I posted this in the wrong group/chat. I am new to this website, so I don't really know y'alls rules on which chat to post what in.