Responses
I could be wrong, but is it Flower? https://www.mangago.zone/read-manga/flower_1/
tho the MC name is Hong Maeru.
You could also try going through this search:
https://www.mangago.zone/r/l_search/?name=+Maru+&page=1
Historical, mpreg story
The main character name is Maru.
Please, help me to find the title of the manga.