I tested early this month at 10 DPO and got a faint line on an FRER. My period is due today and so thought i'd use up my FRER since it was 2 in a box, and also a CB digital as I have that lying around. BFP on the FRER (although not as dark as the control line, but it's a line!), but a BFN on a Clear Blue? I thought CB was supposed to be 99% accurate? and it's the day my period's due too i'm as regular as clockwork on a 30 day cycle.