For anyone interested, here are the insides of two tests, taken 6 days apart. The first was approximately 15/16 DPO and I got 2-3 weeks, and the second was taken 6 days later at approximately 21/22 DPO, which gave me the 3+ weeks reading. The top strips are the super-sensitive ones that detect pregnancy, and the lower strips with two lines are supposed to read your concentration of hCG. I am definitely a newbie at this and know you aren't supposed to open these and try and interpret them, but I thought I'd put them here for anyone as interested as I was. I couldn't find many pictures online, so hope this helps someone!