It is recommended to prohibit eating and drinking for 1-2 hours after taking the oral contraceptive pill, so it is better not to eat immediately. If you eat immediately after taking the pill, the large amount of progestin contained in the pill will stimulate the stomach and intestines, which may cause the patient to experience nausea and vomiting, affecting the efficacy of the drug and leading to contraceptive failure. If the patient does not experience any discomfort and has withdrawal bleeding about a week after the pill, it generally indicates that the contraception is successful. However, the pill still has a certain failure rate. If you want to confirm the success of the pill, you can go to the hospital for a blood test 10 days after intercourse to determine if you are pregnant based on the concentration of chorionic gonadotropin HCG. Most of the contraceptive pills are formulated with estrogen and progestin, and common side effects include gastrointestinal discomfort, nausea, headache, drowsiness, etc. Intermediate-acting or long-acting pills may show irregular vaginal bleeding, so patients are advised to use the pills under the guidance of a doctor and not to use them blindly on their own to avoid affecting their own hormone levels and causing gynecological diseases or infertility.