You can only report grades you have received. You can either submit now, and for the spring course you put "future/current" with no grade. Thus, what you receive will not be factored into your GPA. You can use the grade you receive (whenever your professor submits it) in an update letter or something.
Or, you can, you could also wait until you receive the grade to order the transcript and submit.
To be honest, if you dont know if you will get a B+, it might actually be safer to submit now with the A in the bag. But it sounds like you know youll get an A based on your exam grades, but not from an official school source...so, i would wait.