help! is this a positive? Update - do you think its a chemical?

[divine_kyrie]

I tested every day once I hit 10dpo and got my bfp. When i hit 13dpo the test was significantly lighter. So i tested again the next day and that test was the darkest. Don't worry too much about one test being a little lighter. It could just be the amount of dye in the test.

 

[fifie123]

Please can someone take a look at this and tell me what you think. I've had a couple of fainter pink lines in previous months that came to nothing so am reluctant to let myself believe this.....what do you lot think?? I'm 13dpo

Updated - the 2nd picture shows test at 14dpo with FMU and looks lighter than the first line. Surely thats not right? I'm worried now, can anyone help??

lol are they tesco brand tests? i used them lol