is this bad..??

I was a heavy marijuana user before I got pregnant.. I used it throughout my first trimester to help my morning sickness (of course cutting down a lot) and before I knew I was pregnant I got drunk with some friends. It wasn't hard alcohol, just beer. I was wondering if that could have hurt the babies brain development? My doctor said that the marijuana wouldn't do much damage if at all, and gave me the thumbs up if I needed it. (We are located in Colorado)