Baby Center on MSN5mon
How hCG levels change by week of pregnancy
HCG is often the first indicator of pregnancy – it's what causes a positive result on a home pregnancy test. HCG levels rise ...
Business Insider3y
4 reasons why your pregnancy test reads negative but you could still be pregnant
"Most pregnancy tests will perform well if it is at the time of your missed period, which would typically be 2 weeks after ... a control indicator to prove that the pregnancy test is working ...