Positive Digital , Negative urine/blood at ER

Caroline

Hi everyone, I am new here but have been TTC for over a year now . I have had irregular periods my whole life, but I have been experiencing several pregnancy symptoms recently

. So I took a digital clearblue with fmu a few days ago . It came up positive . I went to the ER 2 days later and both urine and blood said negative. any advice ? Thank you