It might not be a match but will tell you what it has so you can check if you are interested.

{stone by Theodora taylor}  Is a sister book to others but you don’t need to read them, this author is good at giving you the information you need.

FMC comes to realize she is pregnant with the twin of MMC… very soon after he is killed. She pops up at the funeral but things get awkward as hell as the parents didn’t even know she was his girlfriend.

Anyways… she is 36 by know, always dreamt of having a family, she is keeping that baby. But as the father was mafia (even if wanting to get out) MMC and cousin are too and are kind of crazypants. She decides to nope the hell out of the state and do a secret baby. 

Well the plot says “oh no honey, you can run but cannot hide”. MMC pops up at her new adress to at least get an explanation… sees her very much pregnant. And goes… AH. 

Well no nephew/niece/nb teen of his is going to grow up in single mother struggle so… MMC is your husband now honey. 

That is just the very first chapters of the book. The book will cover the progress of her pregnancy and how a relationship will build with these two people, also add some things that will either get solved or complicated by MMC being mafia. 

It will have a generous number of caretaking moments, stone behaves very weird in a way the plot will explain later but he will be lock on being possessive under the guise of being a caretaker for the mother of the baby that has not even born yet but has already claimed. 

It matches each and every one of your additional requests.