I don't know of any superstition that actually came true - the 4 months of keeping mum is likely due to the higher chance of miscarriage, so people wait till the pregnancy is more stable now before circulating. I think beating the 60% odds for IVF implantation is cause for celebration. I waited until after my Oscar to announce to wider group of friends though, as I intend to abort if there's any defects and it'll be awkward to inform that to religious/pro-lifer friends.
Anonymous