If you want to continue with this pregnancy and have a healthy child, there is a chance that it will be OK, if you 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. Good luck to you.
I think its for the best for you and your baby to stop smoking esp weed, i also smoke and did smoke weed until i found out i was preggers and to be honest i feel much better with in my self for giving it up although i do still smoke cigs not as much as before mind slowly im finding i can go longer with out them also! I think you wil make the right choice if not for you for your baby :-) wish you luck!