What are my chances of a successful pregnancy with hba1c of 72?

Do you mean 7.2: Diabetics need early prenatal care and attention to their pregnancy. Having an ha1c close to 7 is a good start.

Diabetes & pregnancy: I hope you mean 7.2 and not 72. (i would tell you not to get pregnancy if it was really 72, but fortunately the measurement doesn't go up that high.) assuming that it is 7.2, you could safely get pregnant and have a good pregnancy outcome. Your diabetes will have to be managed carefully during your pregnancy, and your doctors will likely try to get your a1c even lower--e.g. Mid-6 range.