You might want to go ahead and break the membrane. If there is no activity whatsoever it might be a little too late. Just make sure you stop messing with it if you see blood! I hope the chickies are okay, the hatching process takes so long (from what I've read, I haven't done it YET) and it's really stressful for us and the chicks (I think more for us). I would break the membrane to get some air to the chick, cause that would be the main concern. If there isn't enough air the chick will die. I hope they're okay, and I hope my advice is good! I've done a lot of reading on here, and that's what this advice is based on. Is there anything? Movement? Peeping even a little? If not, how long have they been silent/motionless?