The following symptoms may occur if you are pregnant after an egg buster injection: 1) Increased vaginal discharge, mainly due to the increase of estrogen in the body after the fertilized egg has been laid. 2) The possibility of pregnancy is indicated by measuring the basal body temperature, which is high for more than 15 days. This is a self-reported symptom of pregnancy, but eventually we need to know whether we are pregnant through laboratory tests, such as blood tests for HCG, which can be taken about 15 days after intercourse, and the positive rate will be higher if we are pregnant. If the test is done using morning urine, it can be done about 20 days after intercourse.