Most moms carrying twins go into labor at 36 to 37 weeks, as opposed to 40 in a single pregnancy, Al-Khan says, and some may go even earlier. Generally, if the twins are born after 34 weeks, there should not be a major concern, but a premature baby is still a premature baby, he says.
False pregnancy in humans is less common, and may sometimes be purely psychological. It is generally believed that false pregnancy is caused by changes in the endocrine system of the body, leading to the secretion of hormones that cause physical changes similar to those during pregnancy.
Sometimes, a woman may be pregnant but the home test kit gives a negative result. Common causes of false-negative results include: The test kit is used too early in the pregnancy and hCG levels are too low to be detected. Most test kits shouldnât be used until your period is at least seven days late.