This is an old thread.
I am struggling with this idea too. I have got pregnant every time I've not used contraception, which is twice, intentionally. I recognise how fortunate I am in this respect and that it's not everyone's experience.
I know not to take any chances so I don't, as for me, abortion would be an utter last resort and far harder all round than organising myself or my partner to use reliable contraception in the first place.
I'm sorry for everyone who's experienced a loss.