Two. Presuming you do have a bug and need Abx, then it will depend on what antibiotic you are on. If you are on one of the flouroquinolones - levaquin, cipro-floxin or any with ____ floxin, I would not do any hard running or lifting (possible tendon ruptures). If on something like a z-pak (azithromycin) - no real worries. Sounds like you may be on a sulfa based with the 'charcoal' mouth, but not sure.
Really, it depends on the Abx. Look up the drugs contraindications and adverse effects.