Is it true that some women don't know they are pregnant until they go into labor? if yes, why & how? or am i spending too much time on internet thanks

Too much internet: Although the internet contains a wealth of information and provides a valuable resource, it also contains a lot of junk. It is important to be careful to maintain some healthy scepticism and be aware of sources. I have actually delivered babies to women who denied ever knowing they were pregnant. Although it is doubtful, there is no way to prove differently. Denial can be very powerful.