So I'm nearly 8 weeks pregnant so it doesn't work as well but around 6-7 weeks if you take a test you may notice your line will be lighter which may worry you! BUT if you dilute your urine down with water and test again you may find that the line will be stronger!
This is the Hook effect, it's where your hormone gets too high that the test can't read it properly and in some cases it can cause a false negative!
On my picture the top test is dipped in normal urine and the bottom test is heavily diluted!