5 days late. Negative blood test. Could I still be pregnant?


I am currently 5 days late on my period. Which is very abnormal. I normally have VERY regular periods. I took a hpt 2 days after my missed period it was negative. 4 days after my missed period I had the blood test done. That was negative.os there still a chance I could be pregnant? If so what is the likelihood? And when should I test again?

Thanks in advance.