Identical twins, boy and girl?

14/4 mono/di. My doctor told me that I can still have a chance of having a boy and a girl that are identical??? Also should I be worried about a inverted uterus? My sugar level was 71 and the range is 120-160 so is that something worry about? It's my first pregnancy and I want to do all my research so if you have any information it will be greatly appreciated. Thanks in advance (: