Is it safe to take phentermine while pregnant?

No. Phenetermine is a type of amphetamine which is used for weight loss and appetite suppression. Amphetamines should be avoided in pregnancy. Amphetamine use in pregnancy can be dangerous for the baby. Pregnancy is a time for healthy eating not dieting or suppressing appetite.
No. Phentermine is classified by the fda as pregnancy category x, which means the risks to the baby exceed the potential benefit to the mother. If you become pregnant while on phentermine, stop taking it.