Omeprazole’s not recommended for pregnancy, but you can get a prescription for another type of medicine to reduce stomach acid. Also avoid coffee/tea/acidic/spicy food.. take small meals/snacks frequently to reduce the reflux. And continue the antacids too
Gaviscon worked for me. Other than cutting out coffee and tea totally, I also avoid oily and spicy food. I find that reflux is especially bad when the food is too oily.