Hmmm; even if you do 3 minutes of running, i.e. one lap at roughly a 12 minute/mile pace, followed by 3 minutes of walking, that still amounts to 45 minutes of running over 90 minutes. Maybe I've just had to be super cautious, but I think that may be too much for where you are. Obviously, you are in the better position to judge how you feel, but I know from personal experience that an overuse injury from running can develop rather quickly.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher