The vast majority of MD schools (i.e. those outside the top 40 or so) will be target schools for you (look for schools where the
LizzyM score is 68 +/- 2). The LizzyM score, if you don't know, is GPA*10+(old)MCAT, so for you it is 3.7*10+31 = 68. Unfortunately, there really won't be any schools that are "safeties" for you. Reaches, in general, will be schools with a median MCAT over 33 or median GPA over 3.8.