Missed AF NEED ANSWERS PLEASE

Shay
My last AF was 12/19/16 . My next AF was suppose to be 01/15/17. My periods are very regular and this app is never wrong with my AF'S. Just about 3 days ago I started having little cramps. I have taken 3 HPT since Sunday all came back negative. But yesterday I thought I was getting my AF while standing in line but it was only a little white thin discharge (sorry TMI) has this happen to anybody and they still came to find out that they were pregnant? I have also been having hot flashes, heart burn , small cramps, light discharge, headaches some nausea I have taken 4 test this month all said negative 😔😔 Do I just wait until I go to the doctor or wait until my next missed period which will be February 11