When I entered residency in 1994, three out of six of us were female. The incoming interns the year I graduated were all female. I'm not sure what seriously wanting to raise kids means, but if it means personally being home with the kids, then any full time career would hinder that. No doubt having a serious career and wanting a family is a lot of hard work and sacrifice. It's not a decision one makes lightly, without thinking out the consequences and details.
Good planning is essential.
Knowing your options for childcare and what your comfortable with, having family available and how flexible your spouse's career is are all issues that need to be considered when planning to have children. During residency we do not have much control over the hours we work. I was lucky enough to plan both my pregnancies during residency to avoid the most grueling rotations when my fundal heights were peaking. Then again, you also have to consider the possibility of having a complicated pregnancy and the kind of situation that may bring, e.g. if you had preterm labor and required extended time off work, which may mean you spend extra time in residency or working extra call after returning to work. Once in private practice there is alot of flexibility.