Did the exact same thing found out at 4wks stopped cold turkey and told my doc and now I'm 19-5 and my Lil girl is fine!
Your fine now, as long as you quit now and make sure you dont do it later on. Your baby is not taking your nuturients or anything else just yet, because its connected to a bubble thing I forgot what it called.
Youll be fine. Congrats !
Drinking is much worse than pot but there both especially bad during the first trimester I have a pot card and my doctor recommended eating instead but said drinking is a no no I rarely use pot anymore but It's happened a few times I'm 24 weeks and my baby if perfectly healthy and no complications but everyone is different but if you have stopped that is better
Just make sure you are honest with your doctor about it when you go to your first appointment and I am sure you will get a lecture about it, but do not stress yourself out about something you did prior to knowing you were pregnant. I drank with my last 2 before I knew I was pregnant and they are both healthy little girls (9 and 4).