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.
False Negative Pregnancy Test. Most women will agree that pregnancy test is the greatest or at least the most useful and convenient humankindâs invention. Only one dollar or two, a few minutes, in any place, anytime you can get the answer to the exciting question: pregnant or not. Could our grandmothers dream about that?! In general, pregnancy test is, undoubtedly, the thing! Nevertheless, it has one essential disadvantage: it quite often gives false result. In addition, in most case it is false negative â when pregnancy in fact is, but the test gives false result.