Hi there,
I can definitely see that line, but I'd be wary as it's a blue dye. Here we have a brand that looks similar which is renowned for giving blue lines in the time limit, yet they're fake positives (here they're Sainsbury's own brand). I've had many false positives with them and have now finally given up on using them.
I'd wait a few more days and try with an FRER or Clearblue Plus (they're the only blue dye I trust).