injury to calf

MissFab2012

I injured my calf last Friday and today is Tuesday July 14. I didn't go to the doctor because it feels like its getting better it's not very painful anymore. I've been doing hot compresses some cold and take in Aleve. But I just have a question to see how long is it going to take before I can really do fast paced walking or cardio ? Has anyone ever had an injury like that that may be able to give me some insight? Or should I really go to the doctor?