The level of hCG hormone has to be more than 25 mlU/ml for the pregnancy to be detected. If the level is lower than this, the pregnancy cannot be detected, even after implantation. Therefore, you must wait at least a week or two after missing the period to take the pregnancy test.
Dec 23, 2020 · Three Weeks After Arriving Back in China, Shenyang Resident Tests Positive for Covid-19. What’s new: A Chinese traveler has been confirmed with Covid-19 more than three weeks after her return from South Korea, the local government announced in a statement Wednesday, as the rate of imported cases continues to rise in the country. The Chinese passenger, surnamed Yin, returned to Shenyang, Northeast China’s Liaoning province, on Nov. 29 and tested negative for the coronavirus upon arrival.