(CNN) Add Missouri to the growing list of states seeking to limit abortion rights.

The Missouri Senate passed a bill early Thursday that prohibits abortions after eight weeks of pregnancy.

The bill, HB 126, is known as the "Missouri Stands for the Unborn Act." It bans abortions after a heartbeat is detected. It allows exceptions for medical emergencies but not for pregnancies caused by rape or incest.

Republican lawmakers who voted for the bill say it also bans abortions after a fetus develops to a point where it can feel pain as well as serve as a "trigger" mechanism that would ban abortion in Missouri if Roe v. Wade was ever overturned.

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