One more "pick my flight" question

[disgrajak]

I am flying back from Orlando on a Sunday in May. I checked all of the Sundays in May, and ironically the one I need is $35 more than all the others (Airtran)!! Just my luck! Do you think I should go ahead and book that leg and hope for a credit?? I have a bad feeling it's going to keep going up. All of the other airlines have similar flights $20-$30 more for the same day I need. Anyone have any opinion? I was originally going to wait and see, but it's freaking me out!