Q: My positive HPT is darker today than it was three days ago. Does that mean my hCG level is doubling?
A: A darker line on the HPT does not necessarily mean the hCG is doubling. Sometimes you could get a darker line as your pregnancy progresses, but the urine test is not accurate enough to give you enough information about the hCG rise. Only a quantitative blood hCG test can tell you more about the increase.