There is often already a line present even when you haven't used the stick yet. I would not count them as positives as they appeared after the 10 minute time frame. When dried up, they can sometimes give false positives, that's why they tell you in the instructions not to look at the test after 10 minutes.
I do hope this is the start of your bfp, but try to take a photo at the 10 minute mark, then you can be more certain.
Testing at 6dpo is very unlikely to result in a positive though hun!x