4 days late, BFN!

For the last 2/3 weeks I've had mild cramping and headaches almost daily. I didn't think much of it until AF was late. Still the same cramping and headaches but no AF or BFP. I tested at 2 days late and again today...

both BFN. This isn't normal for me so I was just curious - anyone had this happen and still get a BFP? I know I could just be 'symptom spotting' but writing this out makes me feel a little better!