Confused

My boyfriend & I are "not doing anything to prevent it, if it happens it happens". I've been tracking my periods on a different app for the last 4 months & it said I was supposed to get my period yesterday. I usually get TERRIBLE cramps prior to AF but this time around I haven't had any. I've had sore breasts and a weird nausea feeling but I got a BFN this morning on my test. I've had some pink on the toilet paper only when I wipe - not even enough for a pad. So now I'm late with none of my (usual) PMS symptoms. Any suggestions?