Rebbetzin Kanievsky a”h would share a teaching from her father, Rav Elyashiv zt”l:

A powerful segulah against fear — such as during childbirth or other frightening moments —

is to visualize the letters of Hashem’s Name, Yud–Kei–Vav–Kei, written in the air before your eyes, and to say with full heart:

“Ein od milvado — There is nothing but Him.”

There is no fear when you remember Who is truly in control.