I am only on week5 but like the previous poster said start slow. You don't have to move forward on the weeks if you don't feel ready. I took a break for a few weeks after some foot issues and came back a week behind where I should have been. Today I finished week5 and it felt great. I don't go fast, I probably jog as fast as most people walk. Just take your time and know that you can do this.
I am a very slow jogger. I walk around 3.2-3.5 and jog around 3.7-4 it is what I am comfortable with right now. I am about 80lb overweight though and just finished week 5. I figure I will get faster in time but right now just trying to build the endurance to jog without stopping.