I've pulled my qudricep doing heavy barbell lunges. It hurts when I engage my leg, so I don't think I'll be doing any lower body or possibly even cardio for a few days.
Rest is your best pick. Hot pad and Bengay. I also pulled muscles before or overdid it and had to take a day or two off. If it is bad, rest. If not too bad, you can keep going with Cardio if not too hard on the quads. I am sure others have great advice too. But whatever you do, keep the meals clean. That way you don't lose what you started and you actually keep fueling your body the right way.
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