Im not going to bash you for your choice but I will let you know that I have a friend who smoked pot and cigarettes all throughout her pregnancy and let me tell you that baby was extremly low in birth weight. The baby was 5 lbs 9 oz and 19 inches long full term. The smoke from both stunted the baby's growth in the womb because the smoke contains carbon monoxide which in turn starved the baby of well needed oxygen. So be aware it is possible to have some repurcutions for smoking while pregnant. I'm not saying all babies get this but be prepared. My friend felt horrible after the baby was born and seen how tiny it was and kept telling me what a bad selfish mother she already is. I think she is now going through postpartum depression but wont admit it, and I'm sure having this on her shoulders has contributed to that.
My friend was not drug tested but we are in a different state. I googled for your state and this is the only thing I could really find. Scroll down to the bottom to find a section where it talks about different states and what they do.
Using Illegal Drugs during Pregnancy : American Pregnancy Association
Normally they will not drug test unless they suspect you are on drugs or if the baby is going through any kind of withdrawals or symptoms of drug use. Their haven't been too many studies on cannabis and infants so no one really knows exactly what kind of effect it could have. I would just advise you to be careful.