Membrane sweep question !

Santana🤍🖤 • Married 10 years , mami of 4💜🧡💚💙

Today I went in for a sweep but my doctor said I’m only 1 cm so she can only do the sweep and not the stretch I said okay. But still I’m kind of confused by what that meant. I didn’t know it was a two part thing. How effective is just a sweep?