Hatching eggs - over 21 days

This is a bit of a saga!!
I got 6 hatching eggs and put in incubator.  Bought a new bulb for incubator, but after a week, bought another stronger bulb as temp not getting more than about 90c.  The new bulb got temp to around 100c for another 2 weeks.  No sign of hatching, and we are almost another week on (so 21 days at 100c).  Did I ought to cut my losses and start again?

at the end of last year I had some hatch (under a broody) at 28 days so you never know 

did you mean 100 degrees Fahrenheit it should be at 99.5 or 101 they may hatch a day or two early, if you ment Celsius it was way to hot and sorry but you may have cooked your embryos.  if your using Celsius it's 37.5 the humidity should be around 40- 45% then the last 3 days should be 65%-67% but it also depends on what your hatching this is just the General for normal hatching chicken eggs.