Having intercourse without a condom and not taking birth control pills afterwards is very likely to lead to pregnancy. If a woman is ovulating, there is a good chance that the sperm will combine with the egg, leading to pregnancy, if the woman is not taking safety precautions and the man ejaculates inside the vagina. If the woman is in the safe period, the chance of pregnancy is slightly smaller. If you are not planning to get pregnant or have children, it is recommended that you take the emergency contraceptive pill within 72 hours after the event if you are not taking safety precautions, and the earlier you take the pill, the better the contraceptive effect will be.