It sounds to me like you have no clue what you're talking about. First off, 90-95 F is too low for development to occur. Position of the egg is also very important as the chick can drown if the small end of the egg is down. And rotation is important, humidity, and many other factors. In conclusion, if you're not using an incubator there is no way for the egg to develop just from a lamp. Incubators are also never 100% and usually have a 50% egg hatch rate anyway (maybe even less than that depending on the quality of the incubator).

My mockingbird egg was at a temp at around 90-95 degrees and there used to be a pulsing red vein but there's not anymore but everything else is heathy. but the big black circle in the middle got bigger (or so it looks). Is it ok?