Sometimes they just tell you too much info, you really don't need to know that, and at 20 weeks, it's not really relevant. I had breech bub at 33 weeks adn even then they said it's irrelevant until 36 weeks when they'd "discuss" options with me. She turned though, no worries.
Back in our mums day, they wouldn't have known, so dont stress!!!
good luck xox