Natasha and Bruce will have a special chapter just they can't have kids.

Tony-
Since you were too lazy to do something cute for Tony to tell him you were pregnant. You just walked to his office and opened the door. You threw the pregnancy test at him and yelled "B****! I'M PREGNANT!"
You scared him and he then started to cry of happiness since you would be carrying his child.

Wanda-
She just wrapped the the test up and gave it to you.
Which you were happy that you were having a baby with her.

Clint-
You put a bun in the oven.
"Clint can you check the oven?"

"Sure babe."
He opened the oven door.
"Babe there's a bun in the oven.......Wait are you pregnant?"

You nodded.
He was very happy that you were finally have a baby.

Steve-
You just went up to him and told him you were pregnant.

Peter-
You decide to spray him with silly string blue and pink and told him you were pregnant which he was happy about.

Thor-
You just told him because it's the future heirs of Asgard.

Loki-
You just told him that there might be a little prince or princess running around.

Bucky-
You went to him and say.
"Your child can't wait to see you in 9 months."
He was happy that you were pregnant.