You will probably be fine

Patience is the key. If the chick would have been fine - they can still be fine. Keep an eye on it - even if the membrane gets dry it can still be removed with help when its time and still be JUST FINE. What a viable chick needs in order to hatch is oxygen and time to absorb all the blood and yolk. If it has that it can come through unscathed

Lesson learned is ALWAYS assume its alive and go slowly and carefully just as you would if it was alive. One thing that I do in situations like this is use a q-tip with warm water on the membrane - being careful not to drip any water into the breathing hole. I identify the largest vein on the membrane and then use another q-tip with coconut oil (or antibiotic ointment WITHOUT any painkiller added) to coat that vein so I can clearly see when it has been absorbed through the viewing window without opening the bator. If the membrane start to get really crusty and dried on I will coat the whole membrane - REMEMBER this is ONLY if it already has a breathing hole otherwise coating the membrane could smother it. Once the vein is totally absorbed that doesn't mean the yolk is so I give it even more time. Often when its ready to come out it will start raising a ruckus and struggling - that is when I will slowly begin releasing it from portions of the membrane and shell behind its head. I chip a piece of shell with tweezers leaving both membranes in tact and use a qtip with coconut oil on the double thickness of membrane to see through it and make sure there is no veining. If there is not veining I use tiny cuticle type scissors to carefull clip through both membranes behind the head to release the head so that it can raise its head when IT is ready. I then put it back in and wait for signs it is trying to get out of the shell. Usually that is all it takes and it can do the rest.