Boyfriend flipping out

So I found out I'm pregnant 3 days a go my boyfriend has never been a dad it would be his first child I have two children already teenagers 16 year old and 13 year old. He sometimes is supportive and says is excited but then he says he does not want no baby's and that he's not ready then he keeps on saying where not married and live in different cities I'm confused about how I should react  to his behavior . I'm keeping my pregnancy I'm not terminating it