Feel free to jump on this with your own "not sure" symptoms.
3 weeks ago I had a sudden onset headache, stomach ache and fatigue. I had to leave work early, went to bed and slept for 2 hours and woke up feeling fine. I had a low level headache for about 10 days after, which is very unusual for me. Considered it could be covid but no real covid symptoms and by the time I thought it, 10 days had gone by anyway so didn't get a test.
Around the same time, my kids had snotty noses and youngest had a mild temperature for one night.
A week after my headache episode, my Dad (support bubble) had a bad cold, runny nose etc and some gastro symptoms. He later developed a cough and I said he should get tested but he didn't as it was just a cold.
My husband (vaccinated), mum and brother didn't have any symptoms.