Magnolia, it depends on where you want to go, your ethnicity, and your other qualifications are. Also, you did not state whether your gpa was overall or sciences only.
In general, the lower your gpa, the higher an mcat you need (and vice versa). Underrepresented minorities (African Americans, Native Americans and Puerto Ricans, Mexican Americans) can get in with some lower numbers. Ditto if you can show substantial research experience (ie you have published) or are intereseted in osteopathic medicine.
Someone with a 3.7 (I am assuming this is science gpa) wanting to enter an allopathic program should try to get at least 9's in all three subject areas (this means a 27). Of course, such a score will eliminate you from most of the highly ranked schools (you should get double digits to be competitive for programs in the top 25 or so). Try not to score lower than an 8 in anyone subject (and of course, you would have to make it up by doing better on another subject). In general, scores in the 6-7 range is frowned upon no matter what your gpa/total mcat score is.
Anyway, do your best. Shoot for double digits because it will widen the range of schools you will be able to apply to (and be invited for interviews at). But a score in the high 20's should get you some interviews at some lesser ranked MD schools and most DO programs.
Good luck to you.