Hyaluronic acid is generally considered one of the safer skincare ingredients during pregnancy, and topical application means very little gets absorbed into the bloodstream, so many mums do continue using it. That said, it is always worth checking the full ingredient list of that specific product, since some formulas include other actives that may not be recommended during pregnancy. I would bring it along to your next gynae or PD visit and just run through the label with them, just to be on the safe side. Better to get a proper clearance than to second-guess yourself throughout the pregnancy, right.