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.
Why Would You Get A False Positive Pregnancy Test. Pseudocyesis is a condition in which a non-pregnant woman believes that she is pregnant, even though there is no physical evidence of pregnancy. Also referred to as pseudopregnancy, women with pseudocyesis will often experience real pregnancy symptoms. Pseudocyesis occurs in one to six of every 22 000 births in the United States.