A biochemical pregnancy can be ruled out when the blood HCG value is generally above 2000 U/L and does not drop exponentially on the next day’s recheck. Biochemical pregnancy often occurs within 5 weeks of gestation, i.e. within 35 days of menopause. Some patients do not have a clear history of menopause, but vaginal bleeding and abdominal discomfort occur together with the onset of menstruation, and the bleeding may be slightly more than the usual amount of menstruation, which is also known as “occult abortion”, so many patients only think that menstruation is irregular. In biochemical pregnancy, the blood HCG level will be elevated for a short period of time and then drop to normal level, even most of the patients will not exceed 100-200 U/L, and there is no evidence of pregnancy on ultrasonography. Therefore, if the blood HCG is monitored and is significantly elevated on every other day, a biochemical pregnancy is basically not considered and an ultrasound examination can be performed around 42 days after menopause to find out if there is an intrauterine pregnancy and the development and survival of the fetus. If a biochemical pregnancy occurs, it usually does not require treatment, and the next menstrual period will usually be normal after the biochemical pregnancy, so you can be ready to conceive again at any time. However, if it occurs repeatedly, further examination is needed to understand the cause.