hCG disappears faster out of blood than it does urine, so it's likely it had already disappeared from my blood when it peaked in my pee. It was just totally shit timing because the fact I had positive tests on quite a few different brands the day I got my blood results back made me think it was possible they screwed up my results or mixed them up with someone else's. I have had faint positives until today, now everything is negative apart from the CB which is apparently positive but obviously it's faulty