5 days late but no positive test...

Hey so I have been having pregnancy symptoms for the past 2 weeks ie: fatigue, short of breath, abdominal cramps/twinges, moodiness, full stomache feeling and just generally feeling off. My period is 5 days late and it's usually like clockwork. 2 days before my expected period I had very light spotting, which I never get. I have tested 4 times with different tests and not getting a positive. Anyone else experience this and still end up pregnant? We have been TTC for 6 months now.