Pregnancy Brain: Is It Real?
There have been several studies that have compared non-pregnant women and pregnant women, and found the pregnant women preformed worse on short-term and free recall tasks.
Another study showed that pregnant women scored on an average of 11.7 % lower on memory tasks and each subsequent trimester.
Others believe sleep deprivation and the new found stress of dealing with a major life change could contribute to the absentmindedness during pregnancy.