Alcohol and smoking is really disasters for an individual especially to pregnant lady. I think you should visit your doctor, he will advice you in a better way.
I too did the same thing cuz I didn't believe I was pregnant but now I'm sober n I pray everyday that everything will be ok
Words from my doctor that I found very comforting were that God knew that you didn't know you were pregnant so He has been protecting your baby. Now that YOU KNOW you have a life living inside you turn to Him and ask Him for strength to change your ways and to live healthy for your baby. God bless
There is a chance that your baby will be OK, even though there is an increased risk of fetal alcohol syndrome. Of course, if need to stop all drugs from now on, eat healthy, stay hydrated with non-caffeinated, non-diet drinks (no sugar substitutes except for stevia) and continue with moderate exercise. Make sure you get careful prenatal care and be honest with your doctor about your drinking. If you don't trust your OB enough to be honest with them, find one that you do trust.
Every pregnant future mom worries about the outcome of her pregnancy, even in the best possible circumstances things can and do go wrong. But there is always hope and grace. Good luck to you.