I am 4 days past my missed period. The clear blue taken today (with the cross/line symbol) has left me feeling nervous. It quite quickly turned to an evap line. I did multiple test following this from different cheaper brands today. The CB digital result I took a week ago. I have done a Tesco test this afternoon with no positive line showing whatsoever. Can my levels of hCG be too low still? Head is all over the place.