Generally speaking, most people need about 10-12 days from fertilization to implantation of the fertilized egg, and then to testing with early pregnancy test strips. However, some people have special conditions. On the Internet, some mothers say they can measure within 7 days of pregnancy. From a scientific perspective, this is also possible.
The fertilized egg has no contact with the mother before implantation, so people cannot know its existence. Now, we can calculate more accurately how many days after having sex can lead to pregnancy, as people can detect the presence of this hormone. So, when can pregnancy be tested? Generally speaking, most women can be tested for pregnancy within one week to 10 days after actual pregnancy.
Once the sperm and egg successfully complete the fertilization process, the pregnant woman's placenta will secrete a special substance called human chorionic gonadotropin, commonly known as HCG in medicine, 7-10 days after the fertilized egg implants into the endometrium. After one week of pregnancy, the presence of this hormone can be detected in women's urine, but this substance is rarely secreted in the early stages and is difficult to detect, which is evident 10-14 days after pregnancy.
Generally speaking, after about 18 days of normal sexual activity between couples, urine testing, especially morning urine, can determine whether the couple is pregnant. Pregnancy can be detected in the earliest week and the latest about 3 weeks after sexual intercourse between couples.
