Hi, my name is Linda and I'm new to Backyard chickens.. I literally have a backyard chicken who apparently decided to adopt my home and front porch lol.I don't mind, I used to have chickens and miss them dearly..However I found myself in pickle dealing with some new things I've never been through. For one I find a hen nesting under my porch couple weeks ago and knew the eggs were fertile since I seen her and rooster hanging out around my house approx.3-4 weeks ago.I gave her food and when she got up looking through cracks in porch I counted 14eggs.Well about week and half ago i counted 15, I'm positive she only had 14 before I've counted them multiple times..My question is these 14 babies have all hatched 3-4 days ago and she's abandoned the last egg(15th) few hours later I took inside and made a make shift incubator with heating pad..I'm rotating the egg every couple hours but I've never let my hens in past hatch their eggs, I'm completely new to this.However I raised every hen and rooster I've had from time they were baby chicks where I bought them at local feed mill. How do I know this egg I'm trying to hatch is alive? I've tried homemade candling but the egg is dark Brown and i can't really see.I don't even know for sure the age of the egg and read they're fertile for up to 3 weeks after the deed.Is it possible this egg was a late comer and still has week or so to go? IM completely lost right now, the egg has been on heating pad like3days now and its not stinking or anything I just am unsure as to how long to keep it on there or if I'm wasting my time..Can anyone help me? Sorry for the book