I think posters are being a little harsh saying you will struggle in Physics or are suggesting you shouldn’t take the class. How challenging a course is depends a great deal on the professor and how the class is structured. Will it be difficult? Most likely. But impossible? No. If the professor is decent, there are T.A. or study group hours, enough various ways to earn the required points for the class, and you work hard, I’m sure you can do it.
As far as if the D+ counts nobody here can really answer that. We don’t know the rules of your institution. Look in the catalog or ask someone at your school who knows.
Good luck. Don’t let one class stop you from your goals.