I think a lot of people can understand the broodiness, OP! It’s not an uncommon experience. However, it’s worth remembering that a core symptom of EUPD is difficulty tolerating strong emotions, which can lead to problematic behaviours and decisions. Most of us just sit with those feelings of broodiness, and accept the discomfort. This isn’t a feeling you need to act on.
The research shows that a reasonable proportion of people actually experience stabilization of symptoms as they approach their late 20’s. A reasonable enough proportion that it’s worth hedging your bets that you will be in that group, and can then REALLY enjoy another baby. The more stress you put yourself under, the less likely you are to be in that group.
I’d also recommend doing some reading around ADHD and making sure it’s not complicating your mental health picture. It’s not uncommon for women with EUPD to have ADHD missed, even though ADHD symptoms may be amplifying impulsivity, chaotic lifestyles and behaviours, rejection sensitivity, and dysregulation.
To make sure you learn to tolerate the emotion and don’t rush in (to support good decision making), perhaps in the conversation with your boyfriend, you could agree you would both like a child together and will revisit the conversation in 12-months, and set some goals for that year. If things are still stable and you have both been able to generally meet your individual and relationship goals, then give yourself permission to go for it. Allowing yourself future permission may make it easier to tolerate the emotion right now, and when the emotion comes, you have goals to work toward so you can meet the emotion with action.