Uhh where did you read that? My doctor told me that is not true...
You're doing your baby and yourself a huge favor by quitting and thumbs up for doing it cold turkey, i too had to give up on my weed habit. Its all easy in the end for the little one growing inside of you!
You are fine. I quit smoking cold turkey cigs and weed also when I found out at 8 weeks. Now I'm 28 weeks and 4 days and my baby girl is perfect and very active. Don't stress yourself out about it. That's the best thing you can do for your baby :)