I thought it might be useful to share my experience as I keep reading threads where people are being told they're ridiculous for thinking they might have Covid and cold symptoms are not part of it.
Tuesday - I was sneezing and runny nose
Daughter had a brief slight temp so did an LFT on her, strong positive. Booked us both a PCR for the next day. My LFT was negative.
Wednesday - I had sore throat, runny nose, headache, very tired, still negative LFT.
Daughter slight headache but fine apart from that
Thursday - both get positive results
If it wasn't for DD's brief slight temperature, we would have just been carrying on as normal, I work in healthcare so do LFTs twice a week, which are still showing negative.