vitamin supplements while breastfeeding

I had to go dairy free because my baby has a cow’s milk protein allergy. I’ve been taking my prenatal vitamin still but realized I’m not getting very much calcium. I started taking “calcium magnesium with vitamin d3” as a precaution to make sure I’m getting enough calcium. I probably should of checked with my doctor first. Is this ok to take while breastfeeding? I can’t see anything online stating it’s bad or anything like that. I do have a doctors appointment coming up this week so I plan on asking then. Should I stop taking it?