Last period was July 27, (31 day cycle btw) positive ovulation test august 10, tested positive 3 days before period was due (august 27)

I did a blood test august 27 results came back at 18.4. Nurse said it was low and to come back to reset. Did another blood test money and my results back at 27.4. I’m suppose to go back and do another test tomorrow but I’m scared 😪

Thoughts and advise ?