Radiation of wavelength less than m is invisible and is called ultraviolet radiation. Radiation with wavelength from m to m are called X-rays, and radiation shorter than m all the way to vanishingly small wavelength are called gamma-rays. The electromagnetic spectrum is given in Figure 6.1.
1 So, the earlier after a missed period you take a HPT, the harder it is to spot the hCG. 2  If you wait one week after a missed period to test, you are more apt to have an accurate result. 3  Also, testing your urine first thing in the morning may boost the accuracy. So, home pregnancy tests will be accurate as soon as one day after a missed period for some women but not for others. 2  How you use them â Be sure to follow the directions and check the expiration date. 3  When you use them â The amount of hCG in a pregnant womanâs urine increases with time.
When is the earliest that I can take a home pregnancy test? It is recommended that you wait until you have missed a period to take a home test. A missed period is often one of the first signs of pregnancy. If you cannot wait that long to find out and you know the day you may have conceived, then the earliest you can take a test would be 14 days from possible conception. What if I take a couple of home pregnancy tests and get different answers?