As others have said, don't push too hard. A lot of programs seem to be geared to weekly increases of mileage. I found it was nice to repeat a week a couple of times and feel how much easier a route was second time round.
The 10% rule is a limit, not a target.
Don't worry too much about targets in the short term. If you see a race, set up a plan based on a calendar date and try to keep to a computer calculated schedule, you may be overtraining. the worst thing about overtraining is that you stop enjoying it.
I think it's generally reckoned that it takes about two weeks for the carbon monoxide to leave your bloodstream so you may start to feel a bit better in the next few days. 38" for a 5k from a standing start is not bad at all.
I used an MP3 player on the treadmill to get me through the horrible arduous task of running for over six minutes. The music in the gym was so dreadful thatI had to cover it up.
As I 'improved' I slected longer tracks until I could keep going all the way though Orgone Accumaultor and Thick as a Brick.
I started running outdoors and HORROR! I forgot to charge my MP3 !! So I did without it and couldn't be bothered with it after that.
Sometimes on a run I do feel like I would like a bit of music, but I'd have to select tracks and put them in order and make sure the thing is charged enough to cover my mighty long distance efforts and keep the earphones in and then listen out for traffic and try not to sing along with "Till the cows come home".