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.
Pregnancy health centre. False pregnancy (pseudocyesis) False pregnancy, sometimes called phantom pregnancy, or pseudocyesis, is the belief that you are expecting a baby when you are not really carrying a child. People with pseudocyesis have many or all of the common symptoms of pregnancy, with the exception of an actual foetus. This condition is very rare, occurring in only one to six out of every 22,000 births. It is most common in women aged 20 to 44, although it can affect women of all ages.