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.
Also, very few things will affect the outcome of a home pregnancy test. The few things that might have an impact include drugs that contain the hormone HCG, which might result in a false positive. Drugs, stress, painkillers, birth control pills, alcohol, and the like will not give a false positive. So, if you take a home pregnancy test and receive a positive result you are more than likely pregnant! Keep in mind, too, that just because you receive a negative result does not mean you are 100% not pregnant.