Aaay, mas better talaga na i-clarify mo directly with your OB about this, it's your safety and baby's safety, kaya don't hesitate to call her clinic at least to confirm, okay? Since she knows you're breastfeeding, she might have her reasons or she might have overlooked it, pero importante na makita mo yung actual recommendation from her mismo. A few of us mums always double-check with our doctors when may doubts about medicines while nursing, kaya totally valid ang concern mo! Keep safe, sis.