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.
Detecting Pregnancy Before You Miss a Period. Women who take pregnancy tests too early often donât have high enough levels of hCG in their body for accurate detection. The most accurate time at which you could take a pregnancy test is if you take one around the time of your period. Negative results can sometimes occur because you arenât actually pregnant, or because you might be ovulating later than you think.