I bet boys give you the runs, LOL.
Actually, the mother's body does respond differently when it is carrying a boy than a girl. Something about the fact that there are these Y chromosomes flotaing around in there, her reproductive organs have to work harder to keep her body from attacking the fetus as a foreign object. Also, during times of extreme stress for the mother--such as living through a war--fewer baby boys are born. They have linked this not to a drop in Y chromosomes in men, but as natural abortion in women. Women are just more prone to miscarry boys during that time. From a natural selection stand point, you need more women than men to keep the species going, so the woman's body may interpret extreme stress as a survival problem and abort her boy babies so that she can spend more time having girls. So it may be a good thing that in some cultures a woman goes into seclusion in her house during her pregnancy and is waited on by her family so that she is kept quiet and stress free. Something else that's new, is the study that the more boys a woman bears, the more likely the younger ones will be gay. They were able to discount environment: an only-child boy raised with older stepbrothers or adopted brothers has no additional risk of being gay, and yet a subsequent boy (boy number 2, 3, 4, etc.) raised as an only-child had a higher risk. A boy born after a string of sisters has no additional risk of being gay. There is no correlation at all between birth order and homosexuality in girls. Scientists are kind of scratching their heads over that one. The only thing they can figure out is that a woman's body becomes increasingly hostile to male fetuses and ends up doing something to them that makes them more likely to be gay. Does a woman's body figure so many boys are unnecessary and start taking some of them out of the gene pool?
Some pretty weird stuff goes on when you have a baby. With all the timing issues and hormone changes so the body won't reject the baby and everything, it's really amazing we're all here!