Hello, Im Currently Looking To Get Pregnant, And My Fiancé

Hello, Im currently looking to get pregnant, and my fiancé and I have talked about trying vaginal fisting. We know to try to use tge appreciate precautions such as having me already be aroused and stimulated, using pleanty of lube, and working up to the entire fist. I curious if fisting can hurt a baby once pregnant, or effect your ability to get pregnant?