Bfn but still have a gut feeling I'm pregnant.

Anna
Has anyone been 4 days late and still getting negatives?  I have so many symptoms that I had with both my past pregnancies. Morning sickness, dizziness, acne ( which I never get unless pregnant) to name a few but I keep getting negatives on test. Is it still possible that I could be pregnant? I also had low hcg and progesterone counts with both of our girls could this be the reason that I'm getting negatives still?