OKLAHOMA CITY (AP) — Oklahoma’s Republican Gov. Kevin Stitt signed a Texas-style abortion ban on Tuesday that prohibits abortions after about six weeks of pregnancy, part of a nationwide push in GOP-led states hopeful that the conservative U.S. Supreme Court will uphold new restrictions.

Stitt’s signing of the bill comes on the heels of a leaked draft opinion from the nation’s high court that it is considering weakening or overturning the landmark Roe v. Wade decision that legalized abortion nearly 50 years ago.

The bill Stitt signed takes effect immediately with his signature, but abortion rights advocates already have challenged the new law in court. It’s not clear when the Oklahoma Supreme Court might issue a ruling in the case, but abortion providers say once the new law is in place, they will immediately stop providing services unless the court intervenes.

“There will be people who lose access, even if the halt in services is only brief,” said Emily Wales, president and CEO of Planned Parenthood Great Plains, which operates abortion clinics in Oklahoma City and Tulsa.

The new law prohibits abortions once cardiac activity can be detected in an embryo, which experts say is roughly six weeks into a pregnancy, before many women know they are pregnant. A similar bill approved in Texas last year led to a dramatic reduction in the number of abortions performed in that state, with many women going to Oklahoma and other surrounding states for the procedure.

Dr. Iman Alsaden, the medical director of Planned Parenthood Great Plains, said Texas’ law that took effect in September has given their employees an idea of what a post-Roe country might look like.

“Since that day, my colleagues and I have regularly treated patients who are fleeing their communities to seek care,” Alsaden said. “They’re taking time off of work, taking time out of school and taking time away from their family responsibilities to get the care that until September 2021 they were able to get safely and readily in their communities.”

The bill authorizes abortions if performed as the result of a medical emergency, but there are no exceptions if the pregnancy is the result of rape or incest.

Like the Texas law, the Oklahoma bill would allow private citizens to sue abortion providers or anyone who helps a woman obtain an abortion for up to $10,000. After the U.S. Supreme Court allowed that mechanism to remain in place, other Republican-led states sought to copy Texas’ ban. Idaho’s governor signed the first copycat measure in March, although it has been temporarily blocked by the state’s Supreme Court.

Stitt earlier this year signed a bill to make performing an abortion a felony crime in Oklahoma, but that measure is not set to take effect until this summer, and legal experts say it’s likely to be blocked because the Roe v. Wade decision still remains the law of the land.

The number of abortions performed each year in Oklahoma, which has four abortion clinics, has declined steadily over the last two decades, from more than 6,200 in 2002 to 3,737 in 2020, the fewest in more than 20 years, according to data from the Oklahoma State Department of Health. In 2020, before the Texas law was passed, about 9% of the abortions performed in Oklahoma were women from Texas.

Before the Texas ban took effect on Sept. 1, about 40 women from Texas had abortions performed in Oklahoma each month, the data shows. That number jumped to 222 Texas women in September and 243 in October.