The Mayo Clinic lists over a dozen drugs that don’t mix with mifepristone. They warn about heavy bleeding. You might need to have “a surgical procedure to stop excessive vaginal bleeding or to terminate a pregnancy that was not terminated with the Mifeprex (mifepristone) treatment procedure.”
According to the Mayo Clinic, an incomplete abortion is the number one risk of medical abortion. Other risks include infection, fever, and digestive system discomfort.
There is also the possibility your pregnancy is too far along. The abortion pill is prescribed only when your pregnancy is 70 days or less from the first day of your last menstrual cycle.