Hi,
I'm not an expert as I've only been using these for 3 months now, but I'm not sure that's quite positive yet. It's hard to tell from a picture but that looks mine the day before a positive test. It's dark but I'm not sure it's as dark as the control line yet.
I would start bding like a rabbit anyway for the next few days to be on the safe side and test again tomorrow to see if its darker.
Good luck! Xxx