We did, because our ‘cold’ appeared a couple of days after being with someone who tested positive the day after we’d seen them. We were negative - that was Thursday.
Friday, I had a bit of a temperature so tested again, because we were due to meet a vulnerable friend the following day. Negative.
Saturday we went and saw the friend, and then went to a social thing, where I was pretty antisocial, because I was feeling shit. Had a high temperature. Felt even more shit on Sunday, so stayed in, while DH, who just had a cold but felt OK, went out.
Monday morning tested again - positive. Him too. Ironically, that was the day we both started to feel better.
Stayed in for a few more days, but tested on Thursday - negative.
For me, the difference was the temperature and the general malaise/fatigue, aka feeling shit. I’ve had cold-like symptoms and sore throats several times and tests have been negative. But I didn’t have a temperature and didn’t feel shit.