Progesterone injection is not allowed to have intercourse. The injection of progesterone is mainly to supplement the progesterone, to avoid the low progesterone content in early pregnancy due to the insufficient function of the corpus luteum, which may lead to irregular vaginal bleeding or miscarriage. Stimulation of the cervix after coitus and hormonal changes in the body will lead to the appearance of contractions, which will aggravate the condition and the possibility of miscarriage. Infection is also likely to occur during coitus, which can lead to pelvic inflammatory disease, and in severe cases, can lead to fetal infection and affect development. You need to regularly monitor hormone levels, pay attention to rest, the best to take bed rest, avoid strenuous exercise, strengthen the nutritional intake, pay attention to observe the vaginal bleeding, as well as the amount of bleeding.