10 days late, negative rest results

Would like to know if anyone has been pregnant despite inital negative test results.

AF is 10 days late.

hpt negative... have taken several different brands including First Response and Clear Blue

Blood test at 9 days late negative and I am being referred for a pelvic ultrasound.

AF is never late, ever. I have a 38 day cycle.

Using opk for the last couple of months with clear results. Have had light cramping and little nausea last week and a half.

Would like to remain hopeful but finding it difficult 😭