WMT - Trade position

I will be buying calls on WMT today. I love the double bottom off the 200MA on the daily chart here. And the nice pull back from the run it had from the end of March. I'm going to be buying at the money 120 calls expiring Aug 21. If this trade goes bad it should retest this 200MA on the way down, so it also gives me a place to get out on a retest.