Should I follow the Couch to 5k completely?

Anonymous
I've recently started the Couch to 5k program (I'm doing day 3 tomorrow). I can run a mile on the treadmill nonstop at a good speed and time but when I run outside its the complete opposite which is why I tried it. I'm having an issue with not doing cardio every other day though. I'm used to running on the treadmill 5 days a week. The program suggests you take a day break in between each workout because you're supposed to be sore but I'm not sore at all. Don't get me wrong, the runs are tough and I usually do more than what the plan says and I push myself but I really don't need this break. Instead of running each weekly workout for 3 days can I do it nonstop for 5? Or is this going to effect me badly and not be able to reach my goals of being able to run 1.5 miles nonstop outside in 3 months?
Should I follow the Couch to 5k completely?
5 Opinion