Depends on how sick 😉
If it’s the start of a cold I load up on some zicam and vitamin c supplements as soon as I feel it coming on and keep working through it. If it’s bad enough that I feel the need to stay in bed then I’ll keep up on the supplements, but rest up and hope I’m only down for a day or two. Hydration is helpful too.
The worst is needing rest, pushing through and then losing a week because I didn’t listen to my body.