Is it ok for my gf to do this while shes pregnant?

me and my gf are addicted to some drugs, shes 6 months pregnant and still tells me its ok to keep speedballing (mixture of heroin and cocaine) and it wont hurt the baby. is this true or is she lying to me?
serious responses only please...
Update: well guess what everybody, need not worry about the baby anymore because i found her passed out on the toilet with a needle in her arm, with the fetus in the toilet, i guess its for the best... :( i really wanted to be a father
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