Twigllet kindly provided this link on the May thread a while ago - and I thought others might like to have a crack at it! All the dates were spot on except the conception one for me, I guess we all work in our own funny ways!
healthlink.mcw.edu/article/923526833.html
(sorry, can't get the hang of links!) It is very accurate but that doesn't seem to be helping us late people in May! Humph!