The reasons for prescribing cabergoline have not been mentioned. In any case the drug is contraindicated during pregnancy. Women of reproductive age group who are given cabergoline should mandatorily be advised by the prescriber to use contraception.
The pregnancy can continue since the chances of teratogencity are quite small. She should undergo periodic U/S tests as abundant precaution.
Needless to say she should forthwith stop the medication.