By the time the elf left around midnight, she was feeling better. Hermione reminded herself there was no use in being sick to her stomach with worry. She wouldn’t know for sure if the book held any truth until she took a pregnancy test. It was quite possible that the  Pure-Blood Directory  was cursed to denounce any known relationship with a Muggleborn. The book could have also recognised their shared blood from the rituals. Besides, she was on birth control and did get her period in mid-December. That had been after she lost her virginity to Malfoy. They had only recently been having sex regularly since she was at the Manor.