Failed classes after getting admitted

Hey guys,

I just got admitted into University of Illinois at Urbana Champaign (UIUC). However, after applying and before getting admitted, I had dropped my math class because I was failing. It shows up as withdrew failing (WF) on my transcript. I also failed gym, which shows up as an F. What impact do you think this will have on my admittance?

They may contact you to see what happened.