Maybe a plot where the pregnancy pact was made as a form of rebellion against the strict vampire or werewolf rules in the Twilight universe. They then have to face the consequences and find new ways to co - exist. This could involve trying to protect their unborn children from the various threats in their world.
One idea could be exploring how the characters deal with the unexpected pregnancies in the context of the Twilight world. For example, how they handle the reactions of their families and friends.
A possible plot could revolve around the relationships between the characters changing due to the pregnancy pact. There could be new alliances formed, old ones broken. For instance, some characters who were once enemies might come together to support each other during their pregnancies, while some friends might drift apart because of different views on the pact.
Chapter 108, "Without accumulating virtue through words, calamities of bloodshed will only increase, not decrease.", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 307, "Silver Mine News, Mutinies Abound", is the clearest early answer because it turns Hou Hu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Long Mountain doesn't have a silver mine, how is that possible?" In... and follows through with Zhu Yinhua usually grows in two places: either near silver mines or....
Chapter 288, "On the March, Hou Hu's Wrath", is the clearest early answer because it turns Cloud Dragon Army's situation into a concrete plot event. A useful checkpoint is the way the scene starts with A bit faster, it's been half an hour and we've only covered a... and follows through with Xia Hong watched Lin Kai leave, then turned to look at Xia Chuan and....
Chapter 40, "The National Museum Speaks!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on [Jiang Li claims she copied this herself?
Chapter 339, "The Changes in Li Hu and Yang Zhong, the Hou Family's Opportunity, and Advice (Part 2)", is the clearest early answer because it turns Contribution Value's situation into a concrete plot event. The chapter gives readers a real answer by opening on According to the balance of their Contribution Value, it is actually... and ending on Considering your high Martial Arts Talent, it should be Battle Body....
Chapter 315, "New Policies for Long Mountain, Cold Apple Tree and the Silver Mine", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The setup is Only the third child, Li Xuandu, was ten years older than her and..., but the pressure keeps building through Since childhood, he took her everywhere around Long Mountain, so....
Chapter 9, "The Qiao Family's business isn't big, but they have quite the audacity", is the clearest early answer because it pushes Qiao into a new phase or setting. The chapter gives readers a real answer by opening on Exactly, the Qiao Family isn't that great either.
Chapter 315, "New Policies for Long Mountain, Cold Apple Tree and the Silver Mine", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. It opens with Regarding the issue of the nobility system, there is still a long... and closes on The problem is… "Your proposal is good, but I have a question.. The key payoff is that it turns Great Xia's growth into a concrete upgrade step and sets up the next payoff in the power growth storyline linked to Xia Hong.
Chapter 104, "Hurry up and sign the termination letter, come back to me!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 317, "Wrapping Up the Migration, Great Xia's Flourishing Scene, Star-picking Hall", is the clearest early answer because it turns Li Xuanling's situation into a concrete plot event. The setup is This is clearly a multi-beneficial and highly effective policy., but the pressure keeps building through Her niece's cleverness, Li Tiancheng knows very well..