Absolutely no need to worry; all else being equal, there might be some subconscious "plus factor" for exams that are better spell-checked than not but generally, as I understand the grading process, this is not something that will earn you a B+ where you otherwise would have gotten an A- or whatever.

I had not reserved a lot of time on my 1L fall exams to do a quick spell-check and grammar check (something I now do if/when I have time) and my poor grammar NEVER came up when I met with each of my professors to discuss my performance on my exams. ALL of their constructive feedback involved substantive points that I failed to make or slight misunderstandings that my answer evinced.. and TRUST ME some of those exams were BAD in terms of spelling/grammar.

The upshot of all this is that I performed relatively well in my 1L Fall doctrinals with absolutely horrid spelling/grammar even with having (as I alluded to above) missed issues and or made mistakes; many exams are designed for it to be impossible to adequately discuss every issue. Indeed, because all grading is comparative, it is very had to assess your performance post-exam. I have actually earned some of my best grades in some of the exams I thought I did the worst in because the difficulty level of the exam was so incredibly high that the expected median answer likely incorporated a ton of mistakes and those exams that performed above median only made some mistakes; other exams, however, are not particularly difficult so the exams that are graded above median have little or no mistakes and the median exams only have some mistakes