Doctors prefer Prozac and Zoloft for pregnancy. Anti depressants can cause a range of birth defects. I would suggest she consult a doctor BEFORE getting pregnant so that medication adjustments can be made before hand. However if she does get pregnant before seeing a doctor she shouldn't just stop a medication like that but rather get in for an appointment immediately to discuss potential risks and benefits.
*I am not a doctor. I work as a prescription drug rep and I've worked for the CDC testing medication side effects. You should always talk to a doctor prior to making lifestyle changes. 😉

Doctor question... They would weigh the pros and con's, may switch drugs.