Did I just ruin dinner? Crockpot question.

CupcakeLady041709

I am making corned beef in the crockpot for a get together tonight. I read that it would need to cook on high for 6-7 hours. At 10 I put everything in and turned it on. Around 12 I peaked at it and was surprised that it wasn't hotter. Yeah, I put it on warm instead of high! I popped it up to high at that point but now I'm worried that it may have gone bad in those 2 hours. We're supposed to eat at 5 and I am praying I don't get anyone sick. Should I risk it?