Is it ok to run while sick?

I'm congested in my nose and a little bit in my chest. Today I wasn't able to go to school because of how sick I felt, therefore I wasn't able to go to practice today. I have practice tomorrow morning but don't even know if I should go. I have to meets coming up this week and have a feeling I'm not going to be ready at all. My nose is runny. When I run and cough, I have to stop to spit my flem out. I don't know if I should go to practice in the morning. How can I make a quick recovery. I've been sick for the past 3 days and don't feel any better.