If you want to take a pregnancy test after the injection, you can go to the hospital to have your blood tested for HCG as soon as possible, 10 days after intercourse. Some hospitals require fasting, and you should not eat any food or water while the blood test is being taken. If the result is out of the normal range, you are pregnant; if it is within the normal range, you are not pregnant. You can also take a urine HCG test, which can be done 12 days after intercourse, by buying a pregnancy test and using pregnancy test paper to rule out the chances of pregnancy. There is also a 60% chance of pregnancy after the egg is broken, but not 100%. So during this waiting period, you must relax and not be anxious, so as not to affect your mood if you are not pregnant, and mood factors can also cause delayed menstruation.