"Pregnant woman for 20 years" implies that she was pregnant for 20 years, not that she is a 20-year-old pregnant woman.
It was meant that way. I wanted to convey the feeling of being unable to achieve one's dream, despite too many years having passed since the time we had set for ourselves. A mother unable to give birth to her child seemed to me a disturbing image that could symbolically connect to that feeling. Thank you for playing :)