Clear Blue and FRER

Ruby

Guys! I bought clear blue tests here in Aus because I was sick of indents with FRER. Two days in a row had a faint positive on clear blue looks to have gotten darker, so I did a Frer - and there was no obvious line maybe if I tried really hard I could maybe see one but wasn’t sold… period due today and nothing! OPK peaked on 8th. What does this mean? are they just as dodgy as FRER!