Common App Midterm Report Question

This is a quick question because right now I’m honestly not sure what to do. I’m planning on applying to transfer spring 2021 and am in the process of putting together my documents and stuff and overall, everything seems fine. I have a cumulative 3.76 and this semester all of my grades are in the B+ to A+ range, except for one in a math class which is looking to be a B-. I could make a hundred excuses, but honestly my professor has just given up teaching and I’m awful at math as is. With Covid and everything going on, I can pass/fail it now and submit that, though I worry that would seem worse. Is that a better way to go, or should I just keep the grade as is, hoping it won’t ruin my chances at schools?
PS For clarity sake, I’m applying to mostly schools where the average transfer GPA is 3.4-3.8!