When Meredith found out that she was pregnant with a second child, her already crumbling world collapsed around her. Even with the casualties from the war, overpopulation still held humanity in a tightening chokehold. In an effort to combat the overpopulation, the government instituted a one-child policy. If the pregnancy is discovered in time, the fetus is subject to an abortion. If not, the parent is allowed to keep the child at the price of a heavy fine. If they can't afford the fine, the child is considered government property.
Meredith could never find it in herself to have an abortion, nor did she have the money to pay the fine. In truth, only the 1% would ever see that much money in their life. So she hid the pregnancy as best she could.