My doc has put me on calcium tablets because I dont drink alot of milk and I take all my prenatals if u just ring then should tell you if its safe for you or not
I think its ok to take calcium, I took calcium supplement with both of my pregnancies and my doctor knew about it.
I would talk to ure doc before u do so. If not try alternatives to get calcium like cheese, yogurt. I know its good not just for u but for bby too helps with his /her tooth developement n bones.