My chick pipped late Tuesday night and now, almost 2 days later, still hasn't zipped. She's breathing and chirps every now and then, but has made almost no progress. I read somewhere that you can cut a tiny piece of membrane and if there's blood then the chick isn't ready for you to help it break out of the shell. I did this and there was blood. This is my first time incubating chicken eggs. I'm lost on what to do next. Thanks in advance.