I see a line but I do agree with Giggly that it looks like an evap. I am thinking evap because it is thin, non-uniformly pigmented, and actually looks like it doesn't run straight up and down. FWIW, I have gotten so many Wondfo squinters at 6-7 DPO (Ov confirmed by temping) that have turned out to be nothing when I had betas drawn. So I think Wondfos are prone to evaps. That said, mine were not as strong as your line so I think there's a chance this line is the start of something. However, as others mentioned, 6 DPO and a BFP would be very unlikely just because implantation begins at 6-7 DPO so there wouldn't be any hCG in your urine until a day or two later.
Also just wanted to mention, OPKs alone cannot tell you if you ovulated, or when. They only indicate that your body is preparing to ovulate. Only BBT temping or ultrasound can tell you if/when you actually did drop the egg. If that is a true line and you get it on subsequent tests, is there a possibility that you might be further along than 6 DPO?
GL, I do think it's entirely possible that there is a BFP starting, but I think only subsequent tests will tell!