Well there is no guarantee. If your average MCAT and GPA are slightly lower than the MD average you can try reapplying
early (sep) this upcoming cycle. As an early candidate, the admissions staff tend to be less picky since there are far fewer applications to consider for inviting to an interview. Med Schools will not have any grades from your performance in med sci until you complete a semester and submit the transcript to TMDSAS. They will assess your application with the current undergraduate GPA and MCAT scores.
I know some people have emailed med schools updating their progress. I don't know if this is the appropriate thing to do.