How to determine success after taking levonorgestrel

　　"Zuo Quan" refers to Levonorgestrel tablets, commonly used for contraception. In general, successful contraception may present with withdrawal bleeding, menstrual period, absence of early pregnancy symptoms, ultrasound showing no gestational sac, and negative blood and urine HCG tests. Detailed explanations are as follows:

　　1. Withdrawal bleeding: After taking Levonorgestrel tablets, some women may experience vaginal bleeding, commonly known as withdrawal bleeding. If the bleeding amount is similar to a regular menstrual period and stops spontaneously within 2-3 days, this may indicate successful contraception. However, please note that not all women will experience withdrawal bleeding, and absence of bleeding does not necessarily mean contraceptive failure.

　　2. Menstrual period: If bleeding similar to a regular menstrual period occurs around the expected menstrual time, with normal duration and flow, this usually indicates successful contraception. Timely onset of menstruation is an intuitive indicator of successful contraception.

　　3. Absence of early pregnancy symptoms: If contraception is successful, women generally will not experience early pregnancy symptoms such as nausea, vomiting, drowsiness, or fatigue. However, please note that not all pregnant women will exhibit obvious early pregnancy symptoms, so this is only a reference indicator.

　　4. Ultrasound shows no gestational sac: If contraception is successful, there will be no gestational sac inside or outside the uterus. The gestational sac is an early manifestation of the embryo and will gradually grow and differentiate into a fetus. If ultrasound examination shows no gestational sac, it indicates successful contraception to some extent.

　　5. Negative blood and urine HCG tests: HCG is a hormone secreted by the embryo; if pregnancy occurs, HCG levels in both blood and urine will rise. If a urine pregnancy test using a home pregnancy strip or a blood test for HCG levels yields a negative result, this suggests successful contraception. However, please note that testing too early may lead to false-negative results, so appropriate timing of testing is important.

　　Even with the above-mentioned signs, it cannot be 100% certain that contraception was successful. Moreover, emergency contraceptives should not be used frequently as a regular contraceptive method, as this may cause adverse effects on the body. If you have any doubts about contraceptive effectiveness or experience any discomfort, seek medical advice promptly for further evaluation and consultation.