Ovulatin test....help

Kristin • TTC our rainbow 🌈 baby 👶! Miscarried 4/4/18 at 6 weeks, with our first. #Godhasbiggerplans #mommy2anAngel
Never done one of these before... Only one dark line showed up and one very light line, im using the clearblue easy read. Anyone else use this brand, have this happen? What foes ut mean i have read the paper that comes with them and am kind of confused