Twin: One of two children produced in the same pregnancy. Twins can develop from one ovum (egg) or from two ova (eggs). Twins who develop from a single ovum are called monozygotic or identical twins. They have identical genomes. Twins who develop from two ova that are fertilized at the same time are called dizygotic or fraternal twins. They are nonidentical and have different genomes.
Unfortunately, many women have a small amount of this hormone continuously and if the level gets high enough just before a period, you could get a false pregnancy test result. The best time to use a urine test for pregnancy is three to five days after your missed period.
Improper testing can lead to false positive results. When taking a home pregnancy test, it is very important to read the directions before testing. Your home pregnancy test instructions will specify when test results should be interpreted and when test results are no longer valid.Some tests will produce a faint positive test result if read after the instructed time.alse Positive Pregnancy Test. If you've taken a home pregnancy test and get two lines (or a plus sign depending on the brand and type of test), you assume this means you are pregnant. After all, home pregnancy tests claim an accuracy rate of over 99%.