This happened to me Hun. It took an extra 4 days before my clear blue digi said pregnant. But as I was a poas addict I kept doing FRER everyday and the lines were getting darker. I had 2 clear blu digi's say not pregnant, it's heartbreaking and confusing but just leave it a few days. I don't think mine registered until I'd actually missed my period yet the FRER showed up about 4 days before. Try and be patient, I know it's really hard though.x