The only reason you would “catch it twice” would be because the first time you didn’t really have it, and it was a false-positive.
Or the second time.
Or both.
Well now, don’t be too sure about that. Both my husband and I have had covid twice. Nearly ten months apart to the day.
The first time was early in the spring of 2020 - when it was still hard to get tested. I had all the weird symptoms that they didn’t figure out were symptoms until later - loss of taste, for example. I was quite ill for six weeks.
Second time was in January 2021. Husband was exposed at work, and tested positive, I had symptoms within 2 days of his starting. Second time the symptoms were similar, but it was also different. Both of us were very ill for about three weeks. He developed the pneumonia, I didn’t.
Having had a few vicious flues, lots of colds, bronchitis a bunch of times, and a fair many minor flues - these two illnesses were NOT like any of those. Covid - if ya have a bad case - does not “feel like” a natural illness. It behaves differently.