it is recommended that when you're contractions are lasting for 60 seconds, are 5 minutes apart and you've been having them for an hour you should ring the hopsital.
but my mw said that if i get to this stage and can still breathe through my contractions, then i should ring the hospital when i can no longer breathe through them.
just thought i'd mention this, cos i know there are many people out there like me who hate hospitals and would probably prefer to stay at home longer than they have been told they should if they can manage it.