You don't have to be 18, i'm 16 and my boyfriend is 17 and we live in a council flat. Swimming is a great form of exercise when your pregnant because it's not too straining, but it is advised that you don't do much more then your body is already used to.
Personally i'd advise you to try and go to college because it's always easier to get a betetr job with more qualifications, i'm going to college in september for hairdressing and beauty when my daughter will be 14 months old and even though it breaks my heart that i'm going to have to leave her with somebody else i know that i'm doing itfor her so that i can get a job and so that we can move out of council accommidation because this place is horrible and has the nickname of 'the herion flats' because people used to shoot up in the gardens and one of my neighbours sells weed.
Your parents migth say that now and no doubt they will be upset and dissapointed but you aer their child and they will always love you. My parents said that there was no way i couldlive there with a baby when they found out i waspregnant but then i ended up living there for 9 months because the council couldn't find us a place.
Oh and another thing, don't expect to get a place from the council right away, it took me 9 months and i've known of people who have been on there for years