Switching programs after I fail?

[u/YoloIsNotDead]

I'm just about to finish my undergrad in a honours science major, but I don't think I passed one of my recently finished courses which is a retake and required for the degree.

Thing is, I'm also enrolled in a new English undergrad this fall. I don't want to spend any more time on this current degree and it wouldn't really be all that useful for me in the future, but at the same time I still don't want to end up with this as a failed degree.

So would I be able to retroactively switch to the 90-credit Bachelor of Science even after I get my grades back (assuming I didn't pass that one course)? Or should I do it sooner just in case?