Im pregnant and shouldnt have told the father?

im 5 weeks pregnant.I had a 3 mth relationship which ended months ago and we caught up 5 weeks ago and had . I hadnt heard from him until tonight and i told him. he is in a new relationship, but i now regret telling him as i want to keep the child but dont want him involved. I should not have told him. He sounds like he will want to be involved.What do i do?Please help,i wish i had of kept it to myself. I want to raise the child alone