Pregnant despite negative blood test?

Ladies... please help! I had two faint lines on first response (FRER for FMU & cheapie first response for p.m.) yesterday and faint lines today as well (same set up for the tests). Believed that we did it and was very excited so scheduled a quantitative blood test (~9:45 this morning). The results were negative and it said under 2mI/L. 😧

Is there any chance the blood test is wrong? If not, does anyone have any ideas about what is going on? Thank you so much in advance!!

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