A 28 year old woman with Marfan syndrome attends for preconception counseling. She has been taking metoprolol from the time of diagnosis of Marfan syndrome. Following review by the multi-disciplinary team, she is advised to stop contraception if she wishes. How would you advise her with respect to metoprolol?
A) Continue metoprolol
B) Stop and re-start after 12 weeks
C) Convert to labetalol
D) Convert to labetalol once pregnancy test positive