Helppppp

Please help me find these two mangas be cause I want to continue them ( I don’t remember a lot)

The first one is about a girl who died and went back in time to change her fate so she married this man with a son (idk if he’s his blood or adopted). I also remember her eating these herbs that made her infertile and the last thing I remember is her husband and her woman doctor trying to help her cure it and she gets mad at them.

The other one is about a girl who died in the “real” world and is transmitted into a princess who’s like hated n bullied (I think) and there’s this white haired demon who turns into a big white dog and helps her. The last thing I remember reading is that she moved away from the palace (ended her marriage or engagement) and created this guard system and gave them flying horses to use (I also remember that the place she moved to was very cold and that they couldn’t use this wood because it was magical…I think)

Anyways ik my grammar is bad but please helppppp!