Embrace Friday! You are ready for it! The C25K plan is terrific. Funny your week 4 results are almost identical to what mine were. I was also very nervous about W5 D3 but was up to the challenge as a result of the C25K program. For me, I had hurt my knee during W4 because I was doing to much extra on my run days, i.e., aggressive sprints and stair workouts. As a result I had to take about a week off and then I decided to repeat W3 then W4 to ease back into running and for my knee health. After which W5 turned out to be a breeze.
Good Luck, looks like your on track!
Mike