When is abortion the right choice for a Christian?

I had a debate with someone today regarding Christians who choose abortion over simply telling their parents/peers that they got pregnant out of wedlock and raising the baby.

I feel that most Christian parents, authority figures, peers would rather a person choose to have the baby & either raise it or put it up for adoption as opposed to that person aborting the baby and never telling parents/authority figures/peers. (based on Christians around/close to me as well as those on TV & what they speak most passionately about with regards to out of wedlock vs. abortion).

Because I have the above perception based on my experience of the average Christian – I think that the Christian who chooses abortion is making a selfish choice when it’s all broken down. That’s the choice that you can hide so you don’t have to deal with everyone’s disappointment – even though deep down you know people are more against abortion than unwed mothers.

Is my perception wrong? When posed with this hard life choice is a Christian being lazy & selfish when choosing abortion or would their families support this choice over them being an unwed, single mother?