On day 3 of trying to hatch an egg in my boobs

[Kizmet]

Sorry your little guy didn’t make it. Maybe you could make some sort of “holder” for the egg if you try again?

 

[ChickenCanoe]

I'm sorry it didn't work out too. Things may have gone better if the egg was at the proper temperature for 15 days or so before placing in the bra.
It was clearly delayed due to retarded development and yolk absorption on day 22.
In order to get a viable chick, the temperature must be constantly above 95F. And even at that, it will still be quite late in the best case scenario. Body temp of 98.6 is a full degree low from ideal. But we measure human temperature orally, rectally or under an armpit, not in a bra. That spot would surely be significantly lower.
That's the reason I warned that the OP was candling way too frequently. To take an egg that is at lower than optimal temperature and constantly pull it out of its incubation space will only lower internal temperature - which is what it is all about.

This is a quote from the Brinsea website.

Zone of disproportionate development (27 - 35°C/80.6 - 95°F)
Eggs kept above 27°C (80.6°F) will start to develop. However the development will be disproportionate in the sense that some parts of the embryo will develop faster than others and some organs may not develop at all. Below 35°C (95°F) no embryo is likely to survive to hatch. Typically the heart is much enlarged and the head development more advanced than the trunk and limbs.
The temperature at the lower end of this range is sometimes referred to as
‘Physiological zero’ - the threshold temperature for embryonic development.
Unfortunately different organs appear to have different thresholds resulting in an
unviable entity.
Zone of suspended development (-2°C - 27°C/28.4 - 80.6°F)
Below about 27°C (80°F) no embryonic development takes place. Prior to incubation,
eggs must be stored in this temperature range (preferably around 15°C/59°F)

 

[Sapphire Sebright]

Well, walked around for about half an hour with one of Marshmallow's tiny eggs in my bra, just to get a feel for what it's like... I'm not starting boobincubation yet, though -- I live in Maine, and it's started snowing outside. We'll be getting another snowstorm at then end of the week, supposedly, so it's way too cold to begin boobincubating right now. Maybe sometime in April?
It depends on the temperature of my, well... "incubator," too -- if it's warm enough, then I'll start sometime next month, perhaps.
@Princess Kiara, you are an inspiration. An odd thing to be inspiring, but still an inspiration.

 

[yo momma DUCK]

I’m so sorry for your loss Princess Kiara. We were all rooting for him. May his little silkie heart Rest In Peace

 

[AJoy16]

So sorry for your loss

 

[PrincessKiara]

After some of the kamikaze eggs decided to take a dive out of my bra while turning (thankfully a short fall over a soft bed!!! But they still had me quailing in my Crocs), I decided enough is enough and at a friend's suggestion made a few sets of interconnected drawstring bags out of an old thin shirt. I no longer have to use tissue paper, and the drawstring when pulled tight goes above my bra and keeps any trageggdies from occurring.

 

[SueT]

Glad to hear of your safety innovation and that you aren't giving up!
You can do it!

 

[ChickenCanoe]

I still don't think the temperature will be high enough.
What is the temperature in the drawstring bag?

 

[PrincessKiara]

I still don't think the temperature will be high enough.
What is the temperature in the drawstring bag?

Currently 98.42°F, measured with a medical thermometer.

 

[SueT]

I still don't think the temperature will be high enough.
What is the temperature in the drawstring bag?

but did you look at the photos of the 1st chick after egg was accidentally damaged? Doesn't it look like it had developed just fine?