Welcome to Healingwell miss x.
I wasn't on any meds when breastfeeding. In fact I stopped breastfeeding my youngest daughter in order to start meds. She was over a year so it wasn't too big a deal but I wasn't aware I had a choice. Noone ever told me there were med's I could take while breastfeeding.
Hopefully someone will be on that can help you with this. Congratulations on the pregnancy!
Good judgement comes from experience and alot of that comes from bad judgement.