Just because it has not been studied does not make it safe. Sucking a burning drug into your lungs has to be a real danger for any pregnant women and it is totally irresponsible to say other wise. Marijuana has long term mental health effects on chronic users and is far from benign. I have worked in mental health for over 40 years and have seen the impact of this drug. I accept decriminalizing the drug makes sense but do not kid yourself wide spread usage will have and impact on our society. This women would do well to stop using marijuana  immediately.