You had to tell Mammon that you are pregnant but he was talking to Lucifer and Leviathan

"Mammon.. You have to come with me.."

Mammon: "Why should I?"

"Because you're gonna be a father.." Mammon's eyes widened and he looked at his stomach and after he looked at you

Mammon: "I'm pregnant?" Lucifer and Leviathan started to laugh

"No, I'm pregnant!"

Mammon: "You're pregnant too?" Lucifer spat out the water he was drinking, Leviathan started to cry as he was cracking up with laughter