1 The heart's internal pacemaker regulates and times the beating of the heart via electrical signals.  Electrical signals start at the SA node, causing atria contraction, and then move on to AV node, delaying electrical impulses to allow blood from the atrium to fill the ventricles.
With the First Response new Early Response Twist Pregnancy Test, you can test as early as 6 days before your missed menstrual period. This is the only test that allows you to find out this early, as it is sensitive enough to capture the very scant amounts of the pregnancy hormone.
Therefore, the simple answer to the how early can you take a pregnancy test question is between 7 and 10 days after ovulation ...much better than waiting a full two weeks! More Pregnancy Test Articles. 1  Pregnancy Test Strips. 2  Pregnancy Midstream Tests. 3  Pregnancy Test Review and Comparison Chart.