Just as a matter of outlook, I think that rather than *planning to suck* (which is kinda implied in the "since transcripts will have already been sent out"), why not figure out why it was a struggle and make a plan to deal with it?
That's going to generally work better than trying to game things so that it doesn't matter. You're going to hit things like that in vet school, but you won't have the option to do anything but confront them head-on. So I'd take Caia's advice and think about a tutor or other study changes or whatever to do better. You might find it less stressful to deal with it, kick its butt, and get it out of the way, freeing you up to enjoy classes that are more fun for you rather than dreading physics coming down the pipe.
All of that said .... no, there's not much downside other than what Caia mentioned. And one grade shouldn't be impacting your GPA *too* much, anyway. So if you think that's the best approach for you to take - sure, delay it until apps have gone out and then tack it on after the fact.
As an aside, it was my last pre-req. Wasn't intentional, though. Was just based on when things were offered at times I could take them.