Running Base - hurt

Run Ning has once again been rough with me. After a short break from long distance running, I have been trying to build a running base again. This week was not a very good week. My initial goal was for the next 2 months for me to build a running base of about 40-50km per week. Get the legs conditioned once again to the pounding of the pavement. However, I did a 10km run last evening and now my right calve muscle is slightly pulled. I am walking with a limp now. This is not a good start. Fortunately, I think this limp will go away in a few days. Just in time to put in some mileage next week.