Hello, thanks for using health care magic For sure warfarin is contraindicated in pregnancy and lovenox is usually taken as a safe alternative during pregnancy. It takes about 3 to 5 days for warfarin to get cleared off from the system to a greater extend. It is difficult to say if the warfarin has affected the baby or not at moment. During your follow up, repeated ultrasounds would be helpful to determine if there is a malformation. But there is risk of central nervous system damage which will manifest as seizures and weakness of limbness when the child is born. but the nervous damage occurs when the warfarin is taken most with advanced pregnancy which i think is not your case. Best regards Dr Achuo