Has anyone used these before? Help with result

Kay

I bought this weeks indicator test has anyone used before and able to help interpret the results? T1 is meant to be 1-2 weeks t2 is 2-3 t3 is 3-4 and t4 is 4+. On the instructions the lines look like thet have to be dark but mine are quite faint. Does this matter at all? There is faint lines on t1 & t2 does this still count as me being 2-3 weeks or is it invalid because they are faint?