John stared at her, trying to figure out her logic and deciding that pregnant women were never too logical. Instead, he took his wand out and checked her as he spoke. "My dear, I can't give you a calming potion in the middle of labor, it might stall labour and cause more problems now that your waters have broken."
He helped her lie down as much as possible on the seat of the carriage. "I'm going to check how dilated you are," he said, before pushing her robe up, and checking. "We still have time, my dear. You're only about 7 centimeters, another three to go." He put the robe down again. "Now, Draco's potion was made for pregnant women, so they won't harm the babies, or so he says, but then he gave it to his own wife. Still."