I did something similar - I'm taking step II this Wednesday (yes, the day before match day). I had a pretty front-loaded 4th year schedule and didn't want to screw up my hard work on step I. The only program I can think of that even asked me about it was OHSU and it wasn't a big deal, just kind of casually asked by the chair as he went through my eras stuff. No place told me to hurry up and get it done, so I wouldn't worry. Though if you're still concerned, I'd take the advice above and email the programs you're really interested in. I know a friend going into rad onc who did that, so it won't be considered weird or anything.