Worried

Hello friends,

I received a positive test at 10 dpo. The line was very faint on a first response. I took a test again at 11 dpo, 12 dpo and today at 14 dpo. Below is a picture of the test at 14 dpo, which was also the day after my period was due. Still pretty light. I was expecting a darker line. I have seen pictures of other tests with nice, dark lines. I’m worried that something is wrong because my lines are still light and don’t seem to be getting any darker. Has this happened to anyone before? Is this a bad sign?