A common risk is heavy bleeding, which can be confusing because the pills abort the pregnancy by causing bleeding. Call your doctor if you have concerns such as fever, vomiting, passing out, or other symptoms listed here.
If the medical abortion only partially clears out the pregnancy, any remaining tissues can become infected. You’ll need to have a surgical abortion to remove the infection. (Fever is one possible sign of infection.)
It’s possible that the drugs won’t end the pregnancy. The abortion pill is less effective as time goes on, and cannot be used after 10 weeks gestation, per the FDA. Failure of the pill starts at 2% before 8 weeks, and increases to 13% at 10 weeks. (Some clinics ignore the FDA and give out pills at 11 weeks without acknowledging the increased risks.)