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so not sure what to make of things as haven’t felt unwell at any other point.
The three most likely explanations are that:
a) you were no longer infectious by the time of the first PCR test on the 17th Jan and so it came back negative (same for the 26th test)
b) you were still infectious at the time of the 17th PCR test but it was a false negative, and then no longer infectious for the 26th PCR test
c) the January bug wasn't Covid-19 but just a cold/flu type thing and you'd had asymptomatic Coronovirus at another time - hence the antibodies and no other time feeling unwell[EDIT] Just remember that immunity isn't binary. Just because you have some antibodies it doesn't mean your body will be able to completely combat any subsequent reinfection. This is why the vaccination programme is so important as it give you even better protection against the virus.
Just did a Rapid Antibody test through Bupa. Easy to get an appointment, £65, they prick your finger and take a small amount of blood, then in 5-10 mins you have the result.
https://www.bupa.co.uk/health/payg/covid-testing
It came back positive as having antibodies.
I felt that I had something in early/mid January that lingered for a while - really congested, tired, achy, feeling really cold a lot of the time - but no change to sense of taste/smell or any real cough.
Did PCR tests on 17th and 26th Jan which both came back negative though so not sure what to make of things as haven’t felt unwell at any other point.