How many days of pregnancy can be detected

How many days can tree pregnancy be detected? Generally, after a week of fertilization in the same room, the fertilized egg will be implanted. After the fertilized egg implantation, it can be detected whether it is pregnant. So a week later, you can take blood to check to see if the hcg value is elevated. If you use an early pregnancy test paper test, you can only detect it after half a month of fertilization in the same room. Also look at the sensitivity of the early pregnancy test paper. The sensitivity is low, and it may be detected later. General recommendations for fertilization in the same room about 20 days to test. The above health science knowledge is for reference only, the specific situation needs to be checked in a regular hospital, by professional doctors to judge.