
I only remember reading the first chapter. There'll be a guy and he sees a girl in church(?) praying, calling herself a killer(not sure) but then the wind blows and you can see her stomach, and she'll have a scar on it. I think it was a pretty mature manga. If you know the name please tell me, thank you :)

http://www.mangago.zone/read-manga/bitter_virgin/
I think it's this one
Omegaverse - There's a miscarriage, and they have a girl afterwards. The ML dreams about his grandfather and a dog.
Final Stop
I think that's what you're after
Omg yes tysm
No problem xD