Hi momshie! Yes, calcium carbonate is generally safe during pregnancy, marami sa amin nag-take ng calcium supplements throughout, kasi super importante para sa baby's bones and teeth development plus para hindi kami ma-deplete ng calcium. That said, it's really best to check with your OB muna before starting any supplement para sure na okay sa iyo specifically and sa dosage, especially if may other vitamins or meds ka nang tinatake.