###Human: I consume marijuana and I am 22 weeks preganent. How long will it stay in my system? ###Assistant: Hello. My advice to you that please stop taking marijuana, if you love your baby, then please stop it right now, because it affects your baby growth. And why you want your baby to suffer because of you, so please stop it and the other thing there is no safe antidote of marijuana. So better is to stop it, and yes, marijuana remains in your body system for up to three weeks. Please take medicine regularly and do USG (ultrasound) regularly and please for your child please stop to take marijuana.