Can you measure pregnancy in the same room for 3 days?

Pregnancy can not be detected in the same room for three days. Because whether a woman is pregnant or not is determined by detecting the HCG index in the body, and the index will only rise after the implantation of the fertilized egg, and the whole process usually takes about ten days from the synthesis of the fertilized egg to implantation, so pregnancy cannot be detected in the first three days of cohabitation.