7 bfp's over 7 days, bfn blood test!!

Ok, I don't understand...! I have been getting bfp hpt's since last Thursday, they started light and have been getting stronger. Went to the dr today because I've had some spotting since last night. Just got my results from my blood test...my hcg is apparently 1.42, so that's a big fat negative! How can I possibly have had 7 false positives, using 3 different brands, over 7 days???! I'm utterly despairing! This is a pic of today's bfp at home-this came up within seconds, right in front of my eyes!