Hey ladies a lil advice

I had just found out I am 17 weeks pregnant. Had no idea! Have always had irregular periods and sometimes went without having them for months- didnt think anything of it and was trying to conceive for so long I gave up a few months ago and quit tracking ovulation and periods etc... every few weeks I enjoy a few beers here and there and now freaking out because I just found out via obgyn I am 17 weeks!!!!! Please help or if anyone has ever been in my situation I am scared and nervous and so ashamed

Thanks ladies