What are the signs of an infection months after a medical abortion?

Medical abortion is not a likely cause of any infection, especially not "months" afterward. The signs of genital infection in women include increased or abnormal discharge from the vagina, strong vaginal odor, vaginal bleeding (like spotting between periods or after sex), genital are itching and irritation and, in severe infections, pain in the lower abdomen. See a doctor if you have any of these.