Getting tubes tied

I’ve decided to get my tubes tied after having my second baby. My OB made is sound like she’ll tie them before I give birth?? That doesn’t make any sense to me so I’m thinking maybe I misunderstood her. But she said she’ll have me sign a piece of paper and then tie them 30 days before I have my baby.. I clearly misunderstood her, right? 😂 any advice or anything I should know about getting them tied? I’m honestly scared lol