For the past day in a half i have had a constant cramp in my left calf. should i be worried?

Pain: At your age it probably is of muscular origin and of no significance. It should gradually ease off and disappear

Possible sprain: Given the short duration of you calf pain, it may well be a calf sprain. This is a strain of the gastrocnemus or soleus muscles, the main muscles in the calf. These muscles are frequently injured with sprains and cause significant pain. Stretching may help, as may heat application. If your pain persists for more than a week or become unbearable, see your PCP and consider ortho referral.

Don't worry, watch.: As long as no other symptoms accompany you cramping, there is probably minimal concern for worry. If associated symptoms like heat, swelling and discoloration begin, that would trigger the necessity for a timely evaluation.