Should I wait to retest

Britt • TTC #3RD GIRL GIRL GIRLS
OK so I've been testing since yesterday which I got 4 to 5 faint lines on my hat and just left from the E.R getting blood work done which came back negative. Why would I keep getting faint positive lines if my blood work is negative. And could I still be pregnant??? Here is the pic I just took since I left the er in disbelief, confused.