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I didn't read any replies, but here's my thought:
#1 Wait. Your nose ought to give you fair warning before anything explodes, so don't risk pulling eggs prior to BEING CERTAIN!!
#2 Wait.
#3 Wait.
#4 Know that if your temps are even a bit low, or if you aren't using an auto-turner, the initial blood vessel development can be clustered and look like a blood ring if you have brown eggs or if your room isn't dark enough, or if you candle early (I think day 7 is just a curiosity candle, and one needs to...you guessed it: WAIT!)
#5 Make real determinations at day 14 or later unless you need the space.
Good luck!