greetings friend.toxicology screening for abusive substances usually is not part of routine testing for pregnancy
by gynecologist. However I would recommend that smoking
marijuana even once can do cognitive impairment
to your child and this is not fair to the child's growth and I would recommend you not do any smoking alcohol marijuana or other illicit drugs or even over-the-counter drugs or prescription drugs while pregnant.please make your child's health your #1 priority. What you do to your body while pregnant may affect your child's personality and genetics and health for ever. have a great day.