It could be hours or even weeks its not something to go off, how long av you been 4cm for as i keep having contractions then they stop & im 3cm so i was just wondering i$ you have bin dialated long or not?
It's different for everyone. I lost mine for weeks. But if it has blood in it you need to.go.to hospital as this could be a sign thingss re starting v soon..we gr told in the UK if we have blood in it to.go.in ASAP