Why must thou tempt me?!
Just kidding. As everyone might tell you in a couple moments... Don't stress too much. A C in Organic Chemistry (first semester I assume) is not ideal, but it's not the end of the world either. Generally, most people say either, "Nothing lower than a C in pre-reqs" or "retake any Cs". So all in all, it's really up to you. If you apply to allopathic schools, the C will still be factored into both of your GPAs so in the long run, if you retake OChem and get an A, it'll average to a B (as far as I understand).
If you feel confident in the material, then prove it in OChem 2! Then you might be able to pass it off as a just a lapse.
My opinion, don't worry too much about it, just do better from here on out. Good luck!