B+ in a one credit math course

So I took a course called “mathematical proofs” last fall (2017), and a got a B+ in it (IDK why, must be missing HW or something), however, it was only a one credit course, and it kind of bothers me that I could have done better in a course that was only one credit. I did learn a lot though, and to be honest, the material looked like that of a 3 credit course and it wasn’t all that easy. I do plan on majoring in math, but does it matter if I got a B+ in a one credit math course?

Does it matter to whom?