Hi mama, congratulations on your first pregnancy! A few of us mum friends have actually talked about this before since History of Whoo is such a popular brand here. The main thing to watch out for is retinoids (Vitamin A derivatives), if any of the products you're using contain those, it's generally advised to pause them during pregnancy, and some of the anti-ageing lines like the Cheongidan or Bichup concentrate could potentially have ingredients worth double-checking. One of my mum friends swears by sticking to gentler, hydrating steps during pregnancy and looking out for safer alternatives like peptides or bakuchiol if you still want some anti-ageing benefit without the worry. Honestly the safest move is still to bring your actual product list to your gynae or a pharmacist and go through the ingredient labels together, since History of Whoo products can vary quite a bit across their different lines. Better to be sure than sorry, especially in the first trimester!