That’s exactly it, your immune system is primed to take a swing at it.
I had it early on but by 9 months later I had no readily traceable antibodies, and was told by my doctor that he’d seen reinfections in people within six months of them having had a relatively mild case, and that the second instance had been worse, at least from how they felt, maybe because the body was more primed to attack it. Much of what we feel as being sick is the affects of our own immune system working. When I had it, the actual Covid part before my body figured it out, was fatigue, insane chills like I’ve never had, had a horrible dry couch and everything tasted metallic. Five days in this turned to the more expected cold/flu feeling. Sneezing, runny nose, etc. The first part felt super weird, like nothing I’d had before. The last part was my body kicking it out I guess because a week and one day after first symptoms I felt fine. The cold part lasted 3 days. My work partner who got it never got the cold/flu part but his wife did, and it was her antibody test that let us figure out our common mystery illness.