There is no known detoxification method to remove marijuana from the body other than the passage of time and allowing your body to break down the components or marijuana. Here are some guidelines: -smoke an occasional joint, weed will stay in your system(and I assume that of the fetus) for up to ten days -smoke regularly, for up to forty-five days -smoke constantly, for up to ninety days -in those who have more body fat, marijuana stays in body longer -marijuana potency is another factor. Are you under the care of an obstetrician? I ask because this specialist would speak with you about the importance of not using alcohol, drugs of abuse, nor smoking during pregnancy, and even before becoming pregnant. Vomiting is common during pregnancy and the obstetrician can help you treat that. I suggest that if you live near a University Medical Center, to contact their OB-GYN Department to ask if any of their physicians are following Pregnant women who took any drugs. If so, talk to that doctor(s) to find out whether he/she would like to follow you during the remainder of your pregnancy. Hope I have answered your question. Let me know if I can assist you further.