Looking for a Manhwa I read some time ago

So I’m trying to remember this manga I read some time ago and I want to see what happened to the FL. What I remember from the is thag the FL was neglected and when her menstruation started she ate this herb she heard/read about that would stop the bleeding. She continued to eat that herb every month when her menstruation would start to the point where she no longer menstruated. In her later life she began to search for a doctor that could help her so she could start a family. YEARS later while working in a herbalist store of some sort a traveling doctor entered and that doctor just so happened to know how to help her (I can’t remember the reason why he couldn’t) and he had been kicked out the family he use to work for. She ended up going back in time though she went back to a time where she had already been consuming the herb. She somehow married a Duke; pretty sure she was picked because she couldn’t have kids. The Duke had a nephew that his late brother had left, and the Duke had plans to have his Nephew take over as Duke when came of age since the Duke’s brother was the rightful heir. Some time later in the story we meet the doctor from the beginning of the story and the family he was kicked out of was the one she was apart of now. The story started getting super odd with every child that was conceived was through incest and a strange process where a woman couldn’t have never had a period and said doctor was the one that help preform this ritual. Well that’s where I ended up losing the story, and I hope someone can help as just searching for it on google has been hell.