I don't know.. I will think on it :) You said it takes 2 days after implantation to detect HGC right? It's 2am here so I got the spotting about 6 and a half days after o.. (unless I o'd the same day as positive opk, then it's 7 and a half dpo). Either way 2 days time will put me in afternoon, but my tests say to use fmu..