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.
Causes of a False Negative Pregnancy Result. There are numerous reasons why false pregnancy test results happen. The most common cause of these results is a missed reaction time. Itâs so important that you follow the directions on the box, which indicate reaction time â the time required for the test to give you accurate results.