You're fine taking Calc I concurrently. Most of the time you don't need calc to actually solve problems in mechanics, its just the way you should be viewing the concepts is from a point of view of derivatives and limits. Without a solid footing in calc, common problems like spotting a graph of velocity given a graph of acceleration are unnecessarily complex (coincidentally problems like this appear on the MCAT).
BTW jewels, I think adcoms are gonna love that you took alg-physics and didn't do too well, so the next semester decided the take the same class but harder. Given the same situation, most premeds I know would head in the opposite direction and take alg-based at CC.