South Carolina’s state senate approved an anti-abortion bill on Tuesday that would ban most abortions at about six weeks, a period when most people are unaware they are pregnant.

During a special session to decide whether the bill advances to the governor, who has promised to sign it, the Republican-controlled senate launched into a heated debate over the ban.

The Fetal Heartbeat and Protection From Abortion Act would ban abortions at the earliest detection of cardiac activity, and, if signed into law, would set up a judicial battle over whether the bill is constitutional. The bill already passed the state house legislature with overwhelming support, and is part of a wave of anti-abortion legislation passed or proposed throughout the country since the supreme court overturned Roe v Wade last year and eliminated the constitutional right to abortion.

Abortion access in the south – which already has some of the most restrictive laws in the country – has been dramatically curtailed with new legislation in North Carolina and Florida. A series of Texas laws prohibit abortions after six weeks and make performing abortions a felony punishable up to life in prison.