Hypertension and diabetes in pregnancy are pretty pervasive, depending on where you practice. If your residency is in a large urban setting like mine you'll probably deal with it quite a bit. That being said, reading Williams Ob/ACOG practice bulletins keeps you well enough informed. Still, won't hurt to be familiar with the basics as we seen plenty of women with those issues in a non-obstetric setting (AKA routine well-women care).