Hey Saph
Just butting in again. I know i still got a false +ive 5 days after last pregnyl, what i would suggest (and i know it may mess with your head a little) is to POAS say sat or sun and keep it then POAS again tuesday mornin if its darker then its lookin good, if paler then not so good, but i dont think one is going to give you a conclusive result.
Really hope this is the one for you good luck and big