FRER Detail I missed

Aloha sisters! Small detail I missed - I had a faint pos on a FRER while at target - literally couldn't leave the store without trying - now 13 DPO and had a faint positive again today and a positive clear blue digital. I took a FRER again tonight and it's still faint. REALIZED when at home I pee in a cup and have always dipped my LH strips / HCG strips for 3-5 seconds. Read the paper directions for FRER and it says dip for 20 seconds! Not sure if it's just too early for a high HCG level or if it's because I dip for way less time than I should but I figured I'd share my missed over detail! Happy peeing!