With the memories of Lin Anjing to guide her, she knew very well that when Lin Anjing and Lin's mother were discussing why her menstruation hadn't started, it was unintentionally overheard by Lin Luye. Despite Lin Luye claiming she hadn't heard anything, An Jing wasn't as naive as Lin Anjing and Lin's mother to believe that kind of nonsense from Lin Luye.
It must be noted that at the time, only Lin's mother and Mrs. Gu were aware of Lin Anjing's prolonged absence of her monthly period, one was Lin Anjing's birth mother and the other her sister-in-law. If word got out that her menstruation hadn't started, Lin Anjing would definitely not be able to marry, and it would also be a matter of great embarrassment for them both. Lin's mother and Mrs. Gu were not that foolish, of course, they wouldn't blatantly reveal such information for outsiders to know.
You say it wasn't Lin Luye's doing? She wouldn't believe it even if she were beaten to death!
