if i remember the number correctly, up to 25% of all pregnancies end in a miscarriage, most of them so early on the mom might not even know she was pregnant
that is the main reason me and my wife never announced any of her pregnancies untll she was passed a certain week count (i cant remember the exact number now, that is more her area of expertise, but once you pass a certain mark, perhaps it is 12 weeks, the chance of miscarriage decreases drastically)
