This is an evap like it happens with clear blue tests especially if you leave it more than 10 mins. Test again tomorrow and read it within the time frame
If it’s multiple hours later, I wouldn’t recommend considering as a positive as wouldn’t want you to get your hopes too high, could very likely be an evap. That being said test again in 48hours or even wait until your AF day should be here and see, don’t count yourself out.
Unfortunately that is an evaporation line it looks- happened to me too
I'd check the instructions but after 10 minutes I think you usually have to discard the results xx