Responses
spoiler :
she didnt cheat, the guy she had her first child with got her pregnant again right before the emperor found her, and since she didn't know she was pregnant and they slept together so quickly after meeting the timing matched up, so both she and the emperor thought the baby was his but it wasn't

This manhwa needs to be renamed to "How I started to ruin my kingdom by being horny that one time".
Also, I wonder if the whole baby debacle is Heinrey's plot. As horrible as Trashta is, I doubt she'd have cheated on the emperor at the beginning of their relationship.