It refers to the age of a developing foetus or unborn baby, measured in weeks and days, starting from the first day of the mother’s last menstrual period (LMP).

Source: https://indianexpress.com/article/lifestyle/health/medical-terms-you-should-know-when-pregnant-8623044/

She was eventually given a pill to end her pregnancy, but she says the nurses were reluctant to treat her and wanted to make her feel guilty: "After I expelled the pregnancy tissue, I could see the foetus."

Source: https://www.bbc.co.uk/news/world-latin-america-64784660?at_medium=RSS&at_campaign=KARANGA

The foetus “has not committed any crime” yet remains incarcerated in “deplorable conditions” and unless granted relief will be “likely brought into this world on the concrete floor of the prison cell,” the petition says.

Source: https://timesofmalta.com/articles/view/pregnant-us-inmate-seeks-release-foetus-innocent.1015722