###Human: Had unprotected sex followed by I-pill. How to confirm my partner is not pregnant? ###Assistant: Hi. If she has taken I-pill (Levonorgestrel) in a proper advised dosage, within 48 to 72 hours of unprotected penetrative sex, then she will have an interruption in her normal menstrual cycle to prevent ovulation or fertilization and even conception to have a pregnancy. Within one to two weeks after taking medicine, she starts to have bleeding that is a withdrawal bleed. The regular menstrual cycle will get disturbed for some time until the body gets out of the effects of the externally induced hormones (I-pill). Then it will become normal gradually.