If I am taking Adderall (dextroamphetamine and racemic amphetamine) and I am already 5 months pregnant but all test so far came back ok. Should I just stop?

Risks versus benefit. It is hard to know what impact Adderall (dextroamphetamine and racemic amphetamine) may have on the developing fetal brain. So have a frank conversation with your doctor about the risks and benefit.
Risk vs benefit. Agree with dr kunz. Depends on what you take it for. If stopping it would make you more impulsive or effect you in some way that would effect the baby in a negative way then the answer is no you should not stop taking it.