I doubt that a ride would make any difference to implantation but if it could I think it just as likely that it could jump the egg into the right place as out of it.
Good point!

Thanks all I was just kicking myself because I'd planned to suggest we go on the day before we leave (give it as much time as possible) then half an hour later I said "why don't we go for your birthday?" silly lady

PS - Anyone else notice that the shakehead smiley spits or something at the end? WTH is that?