Freaking out because I drank very heavily at 4 weeks + 5 days before finding out I was pregnant

I binge drank extremely heavily when I was 4 weeks + 5 days and now I am freaking out that I have caused major harm to my baby and don’t know whether I should keep it or not. I already have a child and feel so terribly guilty for not doing a pregnancy test sooner. What is the likelihood of my baby having issues, including FAS? I haven’t drank since and don’t smoke.