You can actually have an abortion up to full term if the mother's life is in danger. However I think the procedure gets a lot more complicated the longer the pregnancy progresses. Yeah I reckon Stacey was more pregnant than they let on cos most women are already about a month gone before they even realise.
Tbh the best person for her to have confided in would have been Charlie because he's been through it all before with Kat.
I think Sean just dislikes the fact that Bradley doesn't seem very tough and probably thinks he's a bit wimpish for his sister. And yeah I don't think he likes Bradley's focus on his career as he could see Bradley choosing his career over Stacey (which he has effectively done

)