It is entirely their responsiblity. There is a reason why most societies/religions encourages only sex after marriage. To engage in sex before marriage then blame the birth control products or lack of an education doesn't really add up.

The rape pregency is a different matter. Before safe abortions the mother had the baby and treated it as an innocent child. Some would be given up for adoption. Some societies force the rapist to pay. No society killed the baby when it was born.