Training for 10k

I am training for Glasgow Women's 10k that is this May. Over the last two weeks I have been following the couch to 10k programme with the help of my Dad. We have so far been doing five minutes walking to start off with and on first week we did 60 seconds of running and 90 seconds of walking for 20 minutes. On the second week we did five minutes walking, then a minute and a half running, two minutes walking and carried on doing training this way for twenty minutes. I do sometimes get slight pain in my lower right leg when running but I was so determined to run this week that in the two days I have done so far of this week that I kept going running through the pain. I really want to reach my goal of running a 10k especially as I am running this 10k to raise money for the charity Tearfund.