help! 13dpo, cycle day 29

mo
13dpo. Middle of day, not held urine and got what looks like a VFL on an internet cheapie. Used a digital with the same urine and it said "not positive". 
Is it possible the cheapie is wrong? I'm scared of low hcg at 13dpo as I've had a chemical before. nothing comes easy for me when it's pregnancy related and the waiting for answers is killing me!