If you are pregnant with a third child, you can judge whether you want it or not by blood HCG level, ultrasound, sex hormone six and other tests, which need to be analyzed specifically. 1. Blood HCG level: under normal circumstances when pregnant in the early stages of pregnancy, the blood HCG level will be doubled, if the growth is not good, it means that the embryo may have abnormalities, you can consider not to. 2. Ultrasound: If the gestational sac appears inside the uterus and grows well, it means that the embryo is better. If the gestational sac occurs in the fallopian tube, it means that there is ectopic pregnancy, so consider not to do it at this time. 3. Sex hormone six: If the hormones in the body are obviously abnormal after pregnancy, it means that the growth of the child may be poor, so you can consider not to. It is recommended to consult a doctor in time after conceiving a third child, and consider whether to have a child according to the individual pregnancy situation and other factors, in order to minimize the possibility of miscarriage.