The HCG test can be done 10 days after intercourse to detect pregnancy, but if the test does not detect pregnancy even after 12 days of intercourse, the patient may not be pregnant, so it is recommended to take another test on the second day with morning urine. If the test is still negative, it is possible that the fertilized egg has just been laid, so you can test again in a few days, or you can go to a regular hospital for a blood test to be more accurate. If the test is negative again, the patient is not pregnant, so it is recommended that if you want to have a baby, you should ask your doctor’s advice, have sex on the day of ovulation and practice good habits to increase the probability of pregnancy and make the pregnant woman have a healthy baby. And to get pregnant women should also pay attention to diet, do not eat spicy food, you can eat more food containing protein, to strengthen the body.