Maybe the pregnancy ends up putting the mother's life at risk, or maybe financial circumstances change suddenly. There are a host of reasons why they might change their mind.
The point being that claiming "how are lesbian couples going to have an abortion" is just massively ignorant on your part; and you still haven't addressed your implicit condemnation of same-sex parenting with your "father figures not being present is what causes delinquency" nonsense. Rofl.