UPDATE: - I took this test at 08:30am yesterday and it was a 10000% negative, it caught my eye again at 21:30 and this is what it looked like.. I know you’re not supposed to read the result after 5 minutes never mind 13 hours but just interested to see if this has happened to anyone else!?

NB I am 10 days DPO and have been testing for 4 days now and all negatives.

I have just taken two more tests this morning and this what is showing (pics in comments as I can’t seem to add them here). I think the positive is quite easy to see on the Clearblue? Or am I going mad!? Thanks!