I can recommend the two novels,"The World's Most Defying Poison Concubine is Too Tsundere" and "The Eunuch's Poisonous Wife Is Having a Husband". The two female protagonists had both returned from the past to take revenge. The female protagonist in "The World's Most Poisonous Concubine is Too Tsundere" had also joined forces with her husband and sisters to kill her. She was wronged and scolded by the world, and finally returned from the past to take revenge. The female protagonist in "The Eunuch's Poisonous Wife Is Pregnant" married the head eunuch in order to take revenge. Then, she and the head eunuch abused scumbags all the way to help her true benefactor remove obstacles. In the end, half a year later, there were rumors that she was pregnant. As for who the father of the child was, there were many different opinions. I hope you like my recommendation. Muah ~