LFTs getting fainter then darker

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Hi all, I am Day 9 now of isolating. My Day 7 and Day 8 tests have been getting fainter but today's is super dark and came up straight away, even before the control line. I also have symptoms now which I didn't before (cough, loss of sense of smell).

I have no idea what is going on, I thought I was almost better! Do I still stop isolating on day 10 if I have no temperature?

Yes you stop isolating even though LFT is picking up infection, you are no longer infectious so can come out of isolation on day 10.