How many days after conception can you use test strips to detect pregnancy

Many newlyweds want to know when they can tell whether they are pregnant after having sex with their husbands that night. The content I want to share with you below is: "How many days of pregnancy can be tested with test strips? This is the knowledge everyone wants to know." Let's take a look!

First of all, let's see how many days of pregnancy can be detected with test strips:

1. Waiting time for sperm and egg after sex: 1-3 days

After intercourse, it takes some time for sperm to merge with the egg. Sometimes he may have to wait for 72 hours, waiting for the delicate egg cell to mature and come out (ovulation period) before he can meet the fusion.

2. The time it takes for the sperm and egg to combine and pass through the bilateral fallopian tubes into the uterus: 3-4 days

After the successful fusion of sperm and egg, the sperm and egg combination will grow and move through the fallopian tubes toward the uterus, and it will take about 3-4 days to reach the uterus.

3. The time it takes for the sperm and egg to combine and linger in the uterus: 2 to 3 days

After the sperm and egg combine and enter the uterus, they have to roam inside for a while before they can find a focus and finally the embryo implants in the uterus.

4. After the embryo implants, the sperm and egg combine and connect with the embryo and the uterus.

The embryo will immediately produce HCG. HCG will appear in the urine, but the concentration is very low at the beginning. Sometimes the early pregnancy test paper will not show it, or it will always show two lines, one dark and one light. The lighter ones may be very light and almost invisible. Many people also call this shallow bar a "watermark".

Therefore, HCG can only be produced from sexual intercourse to successful embryo implantation. And you can understand it by adding up the above days. How long after sex can you test positive for pregnancy?

1. If fertilization is early and embryo implantation is early, HCG will be present in the urine and testicles about 7 days after the first intercourse, but the concentration is very low at this time and the pregnancy test paper cannot detect it. Therefore, you should wait at least 2 to 3 days for the concentration to be higher before you can see two bars, one dark and one light. Therefore, the early pregnancy test paper can detect pregnancy in about 10 days.

2. If both ovulation and implantation are delayed, some people may need to wait about 15 days to detect pregnancy.

Then let's take a look at the common problems that women often encounter when using early pregnancy test strips.

1. Diluted fluid in urine. Drinking too much water may dilute the urine and cause a false negative result.

2. Conducting experiments in the morning and at night may have a certain impact on the results. The highest HCG value is usually found in the urine in the morning, so many instructions recommend testing in the morning, but this is not absolute.

3. When testing, pay attention to the length of the pregnancy test paper that is immersed in urine. Sometimes the length of time that urine soaks into the test strip is too long to make the test result indistinguishable.