Doing cardio directly before weights session is an awful thing to do. Better off doing no cardio if thats all you can manage. You are burning precious glycogen stores with cardio which will mean fat loss is at a minimum. You will then commence a weight session with depleted glyogen stores which will force your body to tear down muscle tissue. You could drink a pro/dex shake after your cardio then commence weights but really not ideal. I work 2 jobs and support a family. Make time.