Hello.. if you have borderline sugars, first line of treatment must always be lifestyle changes (considering the sugars are not too high). If still high, add meds. Insulin is generally the safest but there are guidelines for oral meds too. Depends on your treating doctor. Discuss thoroughly with your doctor regarding your queries.

Oral tablets are not approved for use during pregnancy. If diet fails to keep sugar levels under target range , insulin should be used.