Yes, don't be afraid of repeating a week if you feel you need to. This isn't failure, it's giving your body more time to adapt to the stresses and impact of running, and that's just smart.
Also, I'd recommend slowing down your running pace. At this stage it is more important to get used to the motion of running, rather than worrying about your speed. Once you have finished C25K are running continuously comfortably, then you can work on your speed.
Cross-training with a different form of exercise (lower impact) on your non-running days can also help.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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