I Am Currently 30 Weeks Pregnant. I Have Had Severe

I am currently 30 weeks pregnant. I have had severe morning sickness throughout this pregnancy, I was even hospitalized at one point. I have smoked marijuana almost every day up until last week and quit because I want there to be enough time for it to clear out of my system and the baby's so I won't have problems with DHS. Ive been watched closely and all my ultrasounds are good and the baby is in the 75 percentile for growth rate. I am still concerned about them drug testing my baby. Will his system be cleared by 38 weeks? Do they do urine, blood, or meconium testing for drugs?