Derailment (thought disorder) In psychiatry, derailment (also loosening of association, asyndesis, asyndetic thinking, knight's move thinking, or entgleisen) is a thought disorder characterized by discourse consisting of a sequence of unrelated or only remotely related ideas. The frame of reference often changes from one sentence to the next.
But remember -- you want to be sure you deliver a full term baby if possible. Pregnancy lasts for about 280 days or 40 weeks. A preterm or premature baby is delivered before 37 weeks of your pregnancy. 1  Extremely preterm infants are born 23 through 28 weeks.  Moderately preterm infants are born between 29 and 33 weeks.
If you are unsure of how to calculate the weeks of pregnancy, just ask for your next appointment how far along you are in weeks and days. An example might be 19 weeks and 2 days. Simply count back two days to figure out what day of the week 19 day 0 was and count up from there weekly. Weeks of Pregnancy.