3 weeks clear blue, 5 week? bleeding?

Had really bad cramps, says 3 weeks on clear blue but I've heard it means 5 weeks.. Why is this?! 
Plus I have had some bleeding, went to the doctors midwife won't see me till 8 weeks.
Went to a clinic told me to go to A&E..
However the bleeding has stopped and it just cramps at the moment.