A student

I've always been an A student. Sure, I've made a few bad grades here & there, but in HS all of my "grades that count" were 4.0 or (AP) 5.0, and I made all A's, graduating with a 4.2.
In college, I made my first B's, but still graduated with about a 3.7, which is a little above an A- average, since we had +/- system. In both HS & college I was involved more than the average student, so I was used to juggling things, even though I only worked part time...
In a weird way, I think my GPA is part of my identity. Even when I started this program, I started making A's. For my employer, I also have to maintain a certain GPA, so that I may continue my masters, which makes the pressure even higher.
If I had to place my bets, I am going to make one B this semester. Right now I think my grade is an 84. Sure, it's not horrible, but it is very strange knowing I am in the bottom half of the class. Some of it is specific to the subject, but some of it is just my life is so crazy right now. Something has to give, so is "taking the hit" with a slightly lower GPA that big of a deal? In a way it is "logical", bc it makes more sense than being a poor performer at work (who funds my program), and I still am hoping to keep my funding based on my current grades.
I already have taken a big hit on my personal life/timing hanging out w/ my SO & friends, so I don't feel I can shave off much more time, here. This is making me seriously consider taking only one class next semester, since I have some professional goals that are put on hold right now...if I don't get to work on those during Christmas break, that might be the better decision in the long run, but I hate thinking of delaying my other plans that much longer...
So, what do you think? Is it better to just finish in the 2 years with learning slightly less & making some B's, or should I stretch it out to 3 years, which increases the risk of not finishing but also takes off some stress & allows more professional/personal focus?