As you say, not all councils operate in the same way, but usually they want you to have some kind of link with the area you are applying in, so either job or family. As you are pregnant your family link in the area you want will be a strong one...BUT depending on where you live, the council might prefer for you to stay put in your current housing and the rent would be paid for you because of your unemployed status and benefit claim. Go to your local Citizens Advice Bureau, they will be able to give you more accurate picture of your chances.