In the Gospel of Luke, the angel Gabriel promised a teenager, a virgin, named Mary that she would give birth to a Son; the Son of God, Jesus. Joseph would be his stepdad. How could this be? He told her that her relative, Elizabeth, a woman well past childbearing age, was already six months pregnant (with her son, John the baptizer).
These common, ordinary women, were part of something bigger than themselves or their expectations of themselves. Impossible stuff!