Abortion is legal in Montana.
Here are some clinics I recommend:
https://www.plannedparenthood.org/health-center/montana/helena/59601/planned-parenthood-helena-2443-90790?utm_campaign=helena-health-center&utm_medium=organic&utm_source=local-listing
https://www.allfamilieshealth.org/
https://www.bluemountainclinic.org/