How many days after sex can I use a test strip to detect pregnancy

The emergence of special tools such as pregnancy test strips and pregnancy test sticks has made it much more convenient for ladies to test their pregnancy. But many women also have doubts about this kind of thing. So, how many days after intercourse can you use a test strip to detect pregnancy?

1. How many days after sex can you use a pregnancy test strip to detect pregnancy

Before the sperm and egg combine and the embryo implants, there is no contact with the pregnant mother, so we have no way of knowing its existence. After the embryo implants, the surface trophoblast cells where the sperm and egg combine produce a protease that dissolves the uterine wall in contact with it. The fertilized egg is buried in the functional layer of the uterine wall. At this time, the transformed trophoblast cells will grow and extend many cell protrusions, which are uniformly villi, called villi.

Therefore, the hormone it secretes has a very strange name - human chorionic gonadotropin (HCG). Now, we can calculate more accurately how many days after AA we can detect the presence of this hormone! After fertilization, the egg takes 4-5 days to travel from the fallopian tubes to the uterus and stays in the uterus for 3-4 days. This process takes a total of 7-9 days. Therefore, if you use a more sensitive (15 international units) pregnancy test kit, it is very normal and effective to detect HCG about 7 days after ovulation AA; use a regular pregnancy test strip (25 international units) about 12 days after ovulation.

Generally speaking, women can test whether they are pregnant about a week to 10 days after they are actually pregnant. Once the man's sperm and the woman's egg cell combine to form an sperm and egg combination, about 7-10 days after the embryo implants in the uterine wall, the pregnant woman's embryo will secrete a special substance called human chorionic gonadotropin, which is often referred to as hCG in medicine. It only exists in the pregnant woman's body. About a week after pregnancy, human chorionic gonadotropin will appear in the pregnant woman's urine, but in the first few days of pregnancy, the secretion of this substance is relatively small and it is not easy to be detected. It is usually more obvious 10-14 days after pregnancy. Generally speaking, about 18 days after a normal sexual life, you can determine whether you are pregnant by testing urine, especially morning urine. After sexual intercourse, you can test whether you are pregnant within the first week, or at the latest about 3 weeks.