I'm a housing officer and the majority of the homeless applications we handle are from pregnant females or those with children already, as beyond this, it's fairly difficult to be considered in 'priority need' for homelessness assistance.
First of all, it is not an automatic right for somebody pregnant and homeless to receive assistance with their housing. Various tests have to be applied, including an assessment as to whether they have made themselves intentionally homeless, in which case, no duty would be owed and the case would be passed to social services.
On the whole, the pregnant females we get making homeless applications are young girls who have been living with their parents, who have either been kicked out on announcing their pregnancy, or have been kicked out as soon as the baby arrives.
I actually find that it is the parents in such situations who are far more entitled and unrealistic in their expectations about what the council can and will do to assist their daughter.
Recent legislation changes mean that if a full housing duty is owed to an applicant, that a local authority does not necessarily have to place them into council accommodation. In fact, the majority of our applicants (pregnant or otherwise!) couldn't give two hoots about council housing, and will happily accept an offer of private rented accommodation because they simply want to be housed ASAP.
It is a job that can make you very disillusioned with the world, and there are undoubtedly some utterly idiotic girls who are very entitled, and who do not have the capacity to make sensible and informed choices, but this isn't the case most of the time.