Your problem is probably due to strained calf muscle is a partial tear of the small fibers of the calf muscles.
Take rest as much as possible.
If normal walking hurts, shorten your stride.
Ibuprofen (Advil, Motrin), or acetaminophen (Tylenol) may be helpful to relieve pain and inflammation.
If you still have tenderness in the calf while taking these drugs, do not return to physical activity.
Use hot compression which sometimes gives soothing effect.
Strengthening exercises may be done when there is no pain but within limitation.
If it persists consult your doctor evaluation and appropriate management.
If you need further clarifications, I will be happy to explain you.
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