My son was diagnosed with covid-19 on august23 i was negative. last year i cought it 2 times . for the past 5 days ive had a headache,runny nose,upset stomach and a low grade fever off and on. i was it incubates.could it be covid or a viral infect?

The incubation period is usually less than 7 days but cases of 2 week incubation were reported. You were tested negative more than 2 weeks ago but you could be positive now, either after a long incubation period or you might have a recent exposure in the first week of September. I think you need to quarantine yourself and have the test repeated.