Oooo, really Turdy ?? I dind;t know that. So, it could be lighter at first, then darker as you are more pregnant ???
Posted by Mr.Mannering*wishes she had a sheriff's badge*
Yes
The test picks up the hgc hormone.. the hormone is needed to sustain the pregnancy... the bigger the pregnancy grows the more hormone is needed
http://www.craigmedical.com/hcg_system_amount.htm
If you test at 4 weeks pregnant (at 2 weeks post conception) then the hormone needed to sustain a pregnancy the size of a full stop basically is a lot less than is needed for a 40 week fetus.
The best pregnancy test result for a dark line would be about 6-7 weeks after the date of the first day of the last period.. testing before or on the date period is due would result in a faint line.