Mean preconception A1C in the group of planned pregnancies was 6.2 ± 0.8% and in the group of unplanned pregnancies, it was 6.5 ± 0.4% There was no statistically significant difference in other preconception parameters and pregnancy outcomes between two groups (BMI, basal and bolus inulin dose, total daily insulin dose, birth weight, length, LGA prevalence, macrosomia prevalence). The gene discussed is INS; the disease is Large for gestational age.