I'm due to start week 4 tomorrow and I'm starting to worry about it. I was really pleased that I managed to get through all 3 week 3 runs without stopping (which I didn't manage in weeks 1/2!) but I honestly don't think I could have taken another step at the end! Plus, I was definitely "running" slower than I was walking as my route was much shorter than in week two, or even week one! But reading through everyone's comments, I know that pace is less important than just carrying on! Good job really!
I think I'm going to give Week 4 a try tomorrow morning, but might need to go back to week 3 first if it proves too much. We'll see! Still looking forward to it, weirdly!