A handful of red states are placing bets on abortion bans in the hopes of having the Supreme Court reconsider Roe v. Wade, the landmark decision that legalized abortion nationwide for up to roughly 24 weeks into a pregnancy.

States are quickly passing laws banning abortion when a doctor can detect a fetal heartbeat, at about six weeks into a pregnancy and before many women know they’re pregnant. Such “heartbeat bills” have passed this year in Georgia, Kentucky, Mississippi, and Ohio, and in previous years in Iowa and North Dakota.