Well done, and congratulations on the new baby. Babies are absolutely adorable things, and I can understand the desire for another one soon after. Pregnancy does though, cause the depletion of some nutrients, for the mother. My advice would be to wait at least a little while, to improve your nutritional status, before trying again. This applies to women without diabetes, and is therefore probably even more relevant if you have it.
Concentrate on eating healthily for yourself, and especially food with folates in, before going for the next. Then go for it.