A lot of blood after taking the pill for 10 days may be the withdrawal bleeding caused by the pill. The dose of progestin in emergency contraceptive pills is relatively large, after taking the pills will lead to a significant increase in the level of progestin in the body, after the drug metabolism of the progestin level is significantly reduced, it will cause the endometrium to fall off, so that withdrawal bleeding occurs. After taking the emergency contraceptive pill 10 days after the appearance of more bleeding, it is likely that the emergency contraceptive pill caused by withdrawal bleeding, which is also a relatively common adverse reaction to emergency contraceptive pills, bleeding may be similar to the usual amount of menstruation, generally do not need special treatment. However, after taking the emergency contraceptive pill, it may lead to irregular menstruation for 2~3 months, so we should take effective contraceptive measures during this period to avoid unwanted pregnancy.