Starting Couch to 5k, week 5

So I decided to progress in the C25K program and start on week 5, which is 3 sets of 5 min runs with 3 mins of walking in between.  Instead of starting on day 1, I jumped straight to day 2, which is 2 runs of 8 mins each with 5 mins of walking in between.  And I did it!  I'm very proud of myself in that respect, but kinda scared about day 3, which is a 20 min straight run.  Eek!  Going to do day 2 again on day 2, and then give it my best on day 3, which will be Saturday.. wish me luck!