Open Question: Have any of you taken Nexium or Prevacid for acid reflux while you were pregnant?

This is a class B drug generally refers to the safety during pregnancy, but you can? And I'm not talking about a small burn i mean a serious, open draft, death, pain and groaned on the ground, the battery acid burn your heartburn innards. This is what I get heartburn if I do not take my medicine. I am not pregnant, but I think about the future, I would like to invite your input. I am very grateful.