Advise needed!!

So I am 6weeks today and my S/O keeps trying to push me into an abortion even though he knows my feelings and how I am completely against it. We already have 3 kids. {My son and oldest daughter are from a previous relationship and my youngest is his}

He keeps saying that it would be best because we don't have the room and would have to make so many sacrifices and blah blah blah. I have told him already that I will do it on my and I am not afraid to do it alone due to being alone for a while with my first two. What should I do?