Probably not? At my undergrad, 3rd and 4th year student took many of the same classes. They were all "upper-level." Maybe it wouldn't look so good if you took a bunch of 100 level classes your third year, but even that probably wouldn't be a big deal.
I took intro physics this past year as a junior. We'll see how it turns out, but I wouldn't think it would matter at all. People take classes when they need to... it shouldn't matter when you take them.