😡 irritated!!! question??

So I am late again 4 days to be specific but still getting BFN!!! I am giving up on testing till I go to doctors on the 2nd!! At this point I so badly am hoping I'm pregnant!! But if not AF needs to come so I can get on BD to try again!! Ugh!!!! Is it possible to be pregnant but never get a positive HPT?? Anyone else have this happen and find out pregnant from doctor?