Honestly, vitamin C is generally okay during pregnancy, but since it's specific to your situation and dosage matters, mas safe talaga na i-confirm mo ito with your OB para sure, iba-iba kasi ang vitamin needs depende sa trimester mo at kung may specific concerns ka. A few of my mum friends took vitamin C during pregnancy with doctor's approval, kaya definitely possible, pero better peace of mind if your doc gives the go-ahead!