Hi, I had a heart attack May 31st while alternating a run and walk, but had been doing very little if any cardio prior to this. I also had a quintuple bypass the next day, and am now on a beta blocker. I'd like to start a running program but am, frankly, scared. If I start slow, is it safe, or is there a risk of "dislodging" a clot and having another heart attack?