Maybe I'm testing to early :/

Kayleigh • I'm Kayleigh. Got a beautiful daughter called Lyla who was born on 22/02/2015
Just done another test out my morning urine and it's still really really faint :/ 
This app says I'm 4 weeks 4 days, but really I know I'm only 2 weeks and 4 days. 
Has anyone ever tested at like 2 weeks and what was the outcome of the test?