If you are not pregnant, a single window test would only show the single test line. For two-window tests, the first window would show the test line and the second window would show a single line that looks like a minus (-) symbol. This means you are not pregnant. On a digital test, a negativetest result will say "Not Pregnant" or "No ...
Missing your period could mean that you ovulated later than usual. Wait two weeks after your period is missed, and take the test again for an accurate result. "A very dilute urine (over-hydrating to "study" for the test) is another cause," says Dr. Spitalnic. Don't drink too much water before taking the test.
After 15 days, if embryo implantation had taken place, a pregnancytest would be able to detect the presence of the hormone hCG in your system, and be able to show a positive result. However, one failed IVF attempt does not mean that it's the end of your journey. You can go for a second IVF attempt.
Most false-negative results occur when levels of human chorionic gonadotropin (hCG, also known as the "pregnancy hormone") in the urine are too low for the test to detect pregnancy. This can happen if you take the pregnancytest too early, especially if you ovulated late in the month. This can happen with women who have PCOS.
Read some reviews online and some people had issues with getting false readings both ways. So early that morning got more variety of test : Clear blue plus, Clear Blue digital, then some cheaper brands. Clear blue plus positive a blatant positive , Clear blue digital negative, and negative for the others as well.