Singapoh, i think there are many factors contributing to having a baby naturally
during my ET, Dr Loh, commented that fertilisation of the eggs through IVF not very successful for us, we only have 3 embryos from IVF, the rest from ICSI.
So he thinks the reason for the failure of my last SO-IUI could be that the eggs can't get fertilised, but it is still a guess.
But now you have 3 dearies, so no need to think about the cause. =)