How many days after intercourse without ejaculation can pregnancy be detected?

Generally, pregnancy can be detected about 14 days after unprotected intercourse using a home pregnancy test strip, or through a blood test for human chorionic gonadotropin (hCG) at the hospital approximately one week after intercourse. The details are as follows:

Even without ejaculation during intercourse, pregnancy is still possible. This is because small amounts of semen may enter the vagina during sexual activity, potentially leading to unintended pregnancy. Fertilization typically occurs within 24 hours after ovulation, and embryo implantation takes place around 6–7 days afterward. After implantation, the trophoblast begins producing human chorionic gonadotropin (hCG). At this stage, hCG levels in the blood are very low, but a blood test conducted around seven days after intercourse can detect whether pregnancy has occurred.

If using a home pregnancy test strip, the result will appear later, as these tests detect hCG in urine. Following conception, urinary hCG levels rise gradually and usually only reach a detectable level about 14 days after intercourse.

Unprotected intercourse carries a risk of pregnancy. It's important to closely monitor menstrual cycles and confirm whether pregnancy has occurred via blood hCG testing or a home pregnancy test.